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    PHP substr_compare() Function

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    PHP substr_compare() Function

    PHP substr_compare() function is used to compare two strings from a pre-defined start position upto a specified length. It is binary-safe and optionally case-sensitive.

    Syntax:

      substr_compare($string1, $string2, $start, $length, $case);

    Parameter Values

    Parameter Description
    string1 This is a required parameter. This parameter defines the first string to compare.
    string2 This is a required parameter. This parameter defines the second string to compare.
    Start This is a required parameter. This parameter defines where to start comparing in string1.
    Length This is an optional parameter. This parameter defines how much of string1 to compare.
    Case This is an optional parameter. This parameter holds a boolean value that specifies whether or not to perform a case-sensitive compare:
    • If FALSE - Case-sensitive (Default)
    • If TRUE - Case-insensitive

    Here is an example of substr_compare() function in PHP:

    <html>
<body>

<?php
$str1 = "PHPTPOINT";
$str2 = "PHPTPOINT";

echo substr_compare($str1,$str2,0); // if it returns 0 then both the strings are same
?>

</body>
</html>
    Output:
    0

    Here is an another example of substr_compare() function in PHP:

    <html>
<body>

<?php
$str1 = "PHPTPOINT";
$str2 = "PHP";
$str3 = "phptpoint";

echo substr_compare($str1,$str2,1,2)."<br>";
echo substr_compare($str1,$str2,0,2)."<br>";
echo substr_compare($str1,$str2,-2,2)."<br>";
echo substr_compare($str1,$str3,0,8)."<br>";  // case sensitive
echo substr_compare($str1,$str3,0,8,TRUE)."<br>";  // case insensitive
?>

</body>
</html>
    Output:
    -8
    0
    -2
    -32
    0
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