php-string tagged requests and articles
Categorized request examples and articles tagged with [php-string] keyword How to check if a string contains a substring in PHP?
To check if a PHP string contains a substring, you can use the strpos($string, $substring) function. If the string contains the searched substring, the strpos() function will return the index of the first occurrence of the substring in the string; otherwise "false". In PHP, indexes start at 0. As of PHP 8+, you can use the new str_contains($string, $substring) function to check if a string contains the desired substring or word. The str_contains() function returns "true" if the string contains a substring or "false" otherwise. Also, you can use Regular Expressions to check if a PHP string contains a substring. Regular Expressions, unlike other methods, provide more flexibility but are slower. In this PHP String Contains Substring example, we use the strpos() function to check if the string contains a substring. Click Execute to run the PHP String Contains example online and see the result.
How do I convert a string to int in PHP?
The easiest way to convert strings to numbers in PHP is to use the (int/float/double)$variable cast, which directly converts the string to a number. You can also convert a string to a number using the intval($value, $base), floatval($value), number_format($num, $decimals) and settype($var, $type) functions. The intval() function converts a string to an integer, and the floatval() function converts a string to a floating-point value. The number_format() function converts a string to a number and returns the formatted number on success; if it fails, the function throws an E_WARNING error. The settype() function is used to set or change the type of an existing variable. In this PHP String to Int example, we convert a string to a number using the intval() function. Below you can see more string-to-int conversion examples with detailed descriptions of each method. Click Execute to run the PHP String to Int Example online and see the result.
How do I split a string in PHP?
To split a string into an array in PHP, you can use the explode($separator, $string, $limit) function. The explode() is a built-in function that splits strings into arrays. The function takes three parameters: an input string to split, a delimiter, and, optionally, a limit on the number of array elements. The explode() function converts a string to an array, separating the given string with a delimiter. Both separator and string are required. The optional parameter "limit" specifies the number of array elements to return. In this PHP Split String example, we split a string into an array using the explode() function. Below you can see more examples of splitting strings in PHP with a detailed description of each method. Click Execute to run the PHP Split String to Array Example online and see the result.
How do I compare strings in PHP?
The easiest way to compare PHP strings is to use the logical operators ('==') and ('!='). If you want to know which string is lexicographically greater or lesser, you can use the operators ('<'), ('>'), ('<='), ('>='). You can also compare strings using the strcmp($string1, $string2) and strcasecmp($string1, $string2) functions. The strcmp() function is a case-sensitive safe binary string comparison function that returns 0 if the strings match. The strcasecmp() function is similar but performs a case-insensitive comparison. In this PHP String Compare example, we compare strings using the ("==") operator. Click Execute to run the PHP Compare Strings Example online and see the result.
How do I convert string to lowercase in PHP?
To convert a string to lowercase in PHP, you can use the strtolower($string) function. The strtolower() function takes a string as a parameter and converts all uppercase English characters to lowercase. To convert non-English characters to lowercase, you can use the mb_strtolower() function. All other numeric characters or special characters in the string are left unchanged. In this PHP String to Lowercase example, we convert a string to lowercase using the strtolower() function. Click Execute to run the PHP Lowercase String Example online and see the result.
How to get a substring from a string in PHP?
To get a substring from a string in PHP, you can use the built-in substr($string, $offset, $length) function. The $offset indicates the position at which substr() starts extracting the substring, and the optional $length parameter specifies how many characters to return, starting at offset. In PHP, indexing starts at 0. A negative value means that substr() will return a substring beginning at an $offset from the end of the string. If the optional $length parameter is passed, substr() will return the specified number of characters. If $length is negative, then the specified number of characters will be omitted at the end of the string. In this PHP Substr Example, we extract the first three characters from a string. Click Execute to run the PHP substr() function online and see the result.
How do I concatenate strings in PHP?
To concatenate strings in PHP, you can use the concatenation operator (' . ') and the concatenate assignment operator (' .= '). The concatenation operator (' . ') returns the concatenation result of the right and left arguments. When concatenating, each subsequent line is added to the end of the previous one. A value of any type that is concatenated with a string will be implicitly converted to a string and then concatenated. The assignment operator (' .= ') adds the argument on the right side to the argument on the left side. This is a shorter way to concatenate the arguments and assign the result to the same variable. In this PHP String Concatenation example, we use the concatenation operator (' . ') and return the concatenating arguments. Click Execute to run the PHP Concatenation String Example online and see the result.
How do I interpolate strings in PHP?
To interpolate a string in PHP, you need to enclose the string literals in double quotes and include variables in the string, starting with $. In PHP, string interpolation only works with double-quoted strings. If single quotes are used in the string, then the variable's value is not interpolated, and the string will be printed as-is. In this PHP String Interpolation example, we use interpolation to format a string using several variables. Click Execute to run the PHP String Interpolation Example online and see the result.
How do I convert an array to a string in PHP?
To convert an array to a string in PHP you can use implode($separator, $array), json_encode($array) or serialize($array) functions. The implode() function allows you to concatenate array elements into a single string. To do this, pass an array, and a delimiter to the implode(); the separator will be inserted between the array values. The json_encode() function converts an array to a JSON string. It takes an array as input and returns a JSON array representation. The serialize() function takes an array and converts it to a string. This function is handy if you want to store something in the database and retrieve it for later use. In this Convert PHP Array to String example, we use the implode() function to convert an array to a string. Below you can see more examples of converting a PHP array to a string with a detailed description of each method. Click Execute to run the PHP Array to String Example online and see the result.
How can I get the length of a string in PHP?
To get the length of a string in PHP, use the strlen($string) built-in function. The strlen() takes a string as an argument and returns the length of the string. The strlen() function returns the number of bytes, not characters. If your string contains Unicode characters, strlen() will return a string length bigger than the number of visible characters since Unicode characters are represented in PHP as 2 bytes. To get the number of visible characters, use the mb_strlen($string, 'utf8') function instead of strlen(). Recent versions of PHP have significantly improved the performance of the strlen() function. Multiple strlen() calls for long PHP strings are almost as fast as a single call. In this PHP String Length example, we use the strlen() function to get the length of an ASCII string (without Unicode characters). Click Execute to run the PHP String Length example online and see the result.
How do I replace a string in PHP?
To replace a string with a substring in PHP, use the str_replace($search, $replace, $subject, $count) function. The str_replace() function takes the string to search for as the first argument, the string to replace the old value with as the second argument, and the string where the replacement is to take place as the third argument. The str_replace() function does not modify the original string; instead, it returns a copy of the replaced string. If the optional argument $count is passed, it will contain the number of replacements performed. You can pass arrays to the $search, and $replace to perform multiple replacements simultaneously. You can also replace strings with PHP Regular Expressions (see example below). In this PHP string replacement example, we replace all occurrences of the search string with a substring using the str_replace() function. Click Execute to run the PHP String Replace Example online and see the result.
How to concatenate array elements in PHP using implode() function?
PHP's built-in implode() function concatenates array elements into a string using a specified delimiter. It returns a string resulting from joining the array elements separated by the provided string. To use the implode() function, you should pass two arguments: the string you want to use as the delimiter and the array you want to concatenate. If you pass only one argument (an array), PHP will automatically use the empty string as the delimiter. The implode() function does not change the original array. In this PHP Implode Example, we concatenate array elements using a comma as a separator. Click Execute to run the PHP Implode Example online and see the result.
To check if a PHP string contains a substring, you can use the strpos($string, $substring) function. If the string contains the searched substring, the strpos() function will return the index of the first occurrence of the substring in the string; otherwise "false". In PHP, indexes start at 0. As of PHP 8+, you can use the new str_contains($string, $substring) function to check if a string contains the desired substring or word. The str_contains() function returns "true" if the string contains a substring or "false" otherwise. Also, you can use Regular Expressions to check if a PHP string contains a substring. Regular Expressions, unlike other methods, provide more flexibility but are slower. In this PHP String Contains Substring example, we use the strpos() function to check if the string contains a substring. Click Execute to run the PHP String Contains example online and see the result.
How do I convert a string to int in PHP?
The easiest way to convert strings to numbers in PHP is to use the (int/float/double)$variable cast, which directly converts the string to a number. You can also convert a string to a number using the intval($value, $base), floatval($value), number_format($num, $decimals) and settype($var, $type) functions. The intval() function converts a string to an integer, and the floatval() function converts a string to a floating-point value. The number_format() function converts a string to a number and returns the formatted number on success; if it fails, the function throws an E_WARNING error. The settype() function is used to set or change the type of an existing variable. In this PHP String to Int example, we convert a string to a number using the intval() function. Below you can see more string-to-int conversion examples with detailed descriptions of each method. Click Execute to run the PHP String to Int Example online and see the result.
How do I split a string in PHP?
To split a string into an array in PHP, you can use the explode($separator, $string, $limit) function. The explode() is a built-in function that splits strings into arrays. The function takes three parameters: an input string to split, a delimiter, and, optionally, a limit on the number of array elements. The explode() function converts a string to an array, separating the given string with a delimiter. Both separator and string are required. The optional parameter "limit" specifies the number of array elements to return. In this PHP Split String example, we split a string into an array using the explode() function. Below you can see more examples of splitting strings in PHP with a detailed description of each method. Click Execute to run the PHP Split String to Array Example online and see the result.
How do I compare strings in PHP?
The easiest way to compare PHP strings is to use the logical operators ('==') and ('!='). If you want to know which string is lexicographically greater or lesser, you can use the operators ('<'), ('>'), ('<='), ('>='). You can also compare strings using the strcmp($string1, $string2) and strcasecmp($string1, $string2) functions. The strcmp() function is a case-sensitive safe binary string comparison function that returns 0 if the strings match. The strcasecmp() function is similar but performs a case-insensitive comparison. In this PHP String Compare example, we compare strings using the ("==") operator. Click Execute to run the PHP Compare Strings Example online and see the result.
How do I convert string to lowercase in PHP?
To convert a string to lowercase in PHP, you can use the strtolower($string) function. The strtolower() function takes a string as a parameter and converts all uppercase English characters to lowercase. To convert non-English characters to lowercase, you can use the mb_strtolower() function. All other numeric characters or special characters in the string are left unchanged. In this PHP String to Lowercase example, we convert a string to lowercase using the strtolower() function. Click Execute to run the PHP Lowercase String Example online and see the result.
How to get a substring from a string in PHP?
To get a substring from a string in PHP, you can use the built-in substr($string, $offset, $length) function. The $offset indicates the position at which substr() starts extracting the substring, and the optional $length parameter specifies how many characters to return, starting at offset. In PHP, indexing starts at 0. A negative value means that substr() will return a substring beginning at an $offset from the end of the string. If the optional $length parameter is passed, substr() will return the specified number of characters. If $length is negative, then the specified number of characters will be omitted at the end of the string. In this PHP Substr Example, we extract the first three characters from a string. Click Execute to run the PHP substr() function online and see the result.
How do I concatenate strings in PHP?
To concatenate strings in PHP, you can use the concatenation operator (' . ') and the concatenate assignment operator (' .= '). The concatenation operator (' . ') returns the concatenation result of the right and left arguments. When concatenating, each subsequent line is added to the end of the previous one. A value of any type that is concatenated with a string will be implicitly converted to a string and then concatenated. The assignment operator (' .= ') adds the argument on the right side to the argument on the left side. This is a shorter way to concatenate the arguments and assign the result to the same variable. In this PHP String Concatenation example, we use the concatenation operator (' . ') and return the concatenating arguments. Click Execute to run the PHP Concatenation String Example online and see the result.
How do I interpolate strings in PHP?
To interpolate a string in PHP, you need to enclose the string literals in double quotes and include variables in the string, starting with $. In PHP, string interpolation only works with double-quoted strings. If single quotes are used in the string, then the variable's value is not interpolated, and the string will be printed as-is. In this PHP String Interpolation example, we use interpolation to format a string using several variables. Click Execute to run the PHP String Interpolation Example online and see the result.
How do I convert an array to a string in PHP?
To convert an array to a string in PHP you can use implode($separator, $array), json_encode($array) or serialize($array) functions. The implode() function allows you to concatenate array elements into a single string. To do this, pass an array, and a delimiter to the implode(); the separator will be inserted between the array values. The json_encode() function converts an array to a JSON string. It takes an array as input and returns a JSON array representation. The serialize() function takes an array and converts it to a string. This function is handy if you want to store something in the database and retrieve it for later use. In this Convert PHP Array to String example, we use the implode() function to convert an array to a string. Below you can see more examples of converting a PHP array to a string with a detailed description of each method. Click Execute to run the PHP Array to String Example online and see the result.
How can I get the length of a string in PHP?
To get the length of a string in PHP, use the strlen($string) built-in function. The strlen() takes a string as an argument and returns the length of the string. The strlen() function returns the number of bytes, not characters. If your string contains Unicode characters, strlen() will return a string length bigger than the number of visible characters since Unicode characters are represented in PHP as 2 bytes. To get the number of visible characters, use the mb_strlen($string, 'utf8') function instead of strlen(). Recent versions of PHP have significantly improved the performance of the strlen() function. Multiple strlen() calls for long PHP strings are almost as fast as a single call. In this PHP String Length example, we use the strlen() function to get the length of an ASCII string (without Unicode characters). Click Execute to run the PHP String Length example online and see the result.
How do I replace a string in PHP?
To replace a string with a substring in PHP, use the str_replace($search, $replace, $subject, $count) function. The str_replace() function takes the string to search for as the first argument, the string to replace the old value with as the second argument, and the string where the replacement is to take place as the third argument. The str_replace() function does not modify the original string; instead, it returns a copy of the replaced string. If the optional argument $count is passed, it will contain the number of replacements performed. You can pass arrays to the $search, and $replace to perform multiple replacements simultaneously. You can also replace strings with PHP Regular Expressions (see example below). In this PHP string replacement example, we replace all occurrences of the search string with a substring using the str_replace() function. Click Execute to run the PHP String Replace Example online and see the result.
How to concatenate array elements in PHP using implode() function?
PHP's built-in implode() function concatenates array elements into a string using a specified delimiter. It returns a string resulting from joining the array elements separated by the provided string. To use the implode() function, you should pass two arguments: the string you want to use as the delimiter and the array you want to concatenate. If you pass only one argument (an array), PHP will automatically use the empty string as the delimiter. The implode() function does not change the original array. In this PHP Implode Example, we concatenate array elements using a comma as a separator. Click Execute to run the PHP Implode Example online and see the result.