Comparing PHP strings using the logical operators
You can use the logical operators ("==") and ("!=") to compare two strings. You can use the ("==") operator to check if strings are equal and the ("!=") operator to check if strings are not equal.
Comparing PHP strings using less than or greater than logical operators
You can compare ("<") or (">") comparisons between strings in PHP, as well as between numbers. If two strings start the same and then differ, then the string with the first character that differs will be smaller. This order is called lexicographic (the same is used in dictionaries).
How то check if two strings are the same in PHP?
To compare two strings in PHP, you can use the strcmp() function. This function compares two strings character-by-character (more precisely, byte-by-byte) and returns:
0: - if the strings completely match;
-1: - if string str1 is lexicographically less than str2;
1: - if, on the contrary, str1 is greater than str2.
Since the comparison is byte-by-byte, the case of characters affects the results of comparisons.
Where:
- str1 and str2 (Required): specifies the first and second string to compare
How to compare strings case insensitive in PHP?
To compare strings case-insensitively in PHP, you can use the strcasecmp() function. The function differs from strcmp() in that it does not compare the whole world but the first length bytes. If length is less than the length of the smallest of the strings, then the strings are compared as a whole. The strcasecmp() function compares two strings character-by-character (more precisely, byte-by-byte) and returns:
0: - if the strings match exactly;
-1: - if string str1 is lexicographically less than str2;
1: - if, on the contrary, str1 is "greater than" str2.
Since the comparison is byte-by-byte, the case of characters affects the results of comparisons.
Where:
- str1 and str2 (Required): specifies the first and second string to compare