Home > Article > Backend Development > PHP function strcasecmp() that compares two strings
Example
Compare two strings (case-insensitive):
<?php
echo strcasecmp("Hello world!","HELLO WORLD!");
?>Definition and usage
strcasecmp() Function Compares two strings.
Tip: The strcasecmp() function is binary safe and is not case-sensitive.
Tip: This function is similar to the strncasecmp() function, except that with strncasecmp() you can specify the number of characters for each string to be compared.
Syntax
strcasecmp(string1,string2)
| Parameters | Description |
| string1 | Required. Specifies the first string to compare. |
| string2 | Required. Specifies the second string to be compared. |
Technical details
| Return value: | This function returns:
|
| 4+ |
Instance 1
Compare two strings (not case sensitive, HELLO and hELLo output the same):
<?php
echo strcasecmp("Hello","HELLO");
echo "<br>";
echo strcasecmp("Hello","hELLo");
?>Instance 2
Different Return value:
<?php
echo strcasecmp("Hello world!","HELLO WORLD!"); // The two strings are equal
echo strcasecmp("Hello world!","HELLO"); // String1 is greater than string2
echo strcasecmp("Hello world!","HELLO WORLD! HELLO!"); // String1 is less than string2
?>strcasecmp — Binary safe comparison of strings (case-insensitive)
int strcasecmp ( string $str1 , string $str2 )
Return value:
//如果 str1 小于 str2，返回负数；如果 str1 大于 str2，返回正数；二者相等则返回 0。
Simple example:
<?php
$var1 = "Hello";
$var2 = "hello";
if (strcasecmp($var1, $var2) == 0) {
echo '$var1 is equal to $var2 in a case-insensitive string comparison';
}
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