PHP strcasecmp() Function

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Compare two strings (case-insensitive):

echo strcasecmp("Hello world!","HELLO WORLD!");

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Definition and Usage

The strcasecmp() function compares two strings.

Tip: The strcasecmp() function is binary-safe and case-insensitive.

Tip: This function is similar to the strncasecmp() function, with the difference that you can specify the number of characters from each string to be used in the comparison with strncasecmp().



Parameter Description
string1 Required. Specifies the first string to compare
string2 Required. Specifies the second string to compare

Technical Details

Return Value: This function returns:
  • 0 - if the two strings are equal
  • <0 - if string1 is less than string2
  • >0 - if string1 is greater than string2
PHP Version: 4+

More Examples

Example 1

Compare two strings (case-insensitive = HELLO and hELLo will output the same):

echo strcasecmp("Hello","HELLO");
echo "<br>";
echo strcasecmp("Hello","hELLo");

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Example 2

Different return values:

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

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