How to compare strings in php regardless of size

In PHP, you can use the built-in function strncasecmp() to compare strings without case sensitivity, the syntax is "strncasecmp(str1,str2,length)". If the return value is 0, it means that the two strings are equal; if the return value is less than 0, it means that str1 is less than str2.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php case-insensitive comparison String

<?php
echo strncasecmp("Hello","Hello",6);
echo "<br>";
echo strncasecmp("Hello","hELLo",6);
?>

Output:

0
0

Because the strncasecmp() function is not case-sensitive, the output of Hello and hELLo is the same.

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Related function introduction:

strncasecmp() Function is used to compare two strings (case insensitive).

Syntax:

strncasecmp(string1,string2,length)

Parameters:

• ##string1 Required. Specifies the first string to compare.

• #string2 Required. Specifies the second string to be compared.​

• #length Required. Specifies the number of characters per string used for comparison.

• 0 - If the two strings are equal

• <0 - If string1 is less than string2

• >0 - If string1 is greater than string2

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