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substr_compare

substr_compare() compares main_str from position offset with str up to length characters. Test substr_compare online.

int substr_compare ( string $main_str , string $str , int $offset [, int $length [, bool $case_insensitivity = false ]] )

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substr_compare

(PHP 5, PHP 7, PHP 8)

substr_compareBinary safe comparison of two strings from an offset, up to length characters

Description

substr_compare ( string $haystack , string $needle , int $offset , int|null $length = null , bool $case_insensitive = false ) : int

substr_compare() compares haystack from position offset with needle up to length characters.

Parameters

haystack

The main string being compared.

needle

The secondary string being compared.

offset

The start position for the comparison. If negative, it starts counting from the end of the string.

length

The length of the comparison. The default value is the largest of the length of the needle compared to the length of haystack minus the offset.

case_insensitive

If case_insensitive is true, comparison is case insensitive.

Return Values

Returns < 0 if haystack from position offset is less than needle, > 0 if it is greater than needle, and 0 if they are equal. If offset is equal to (prior to PHP 7.2.18, 7.3.5) or greater than the length of haystack, or the length is set and is less than 0, substr_compare() prints a warning and returns false.

Changelog

Version Description
8.0.0 length is nullable now.
7.2.18, 7.3.5 offset may now be equal to the length of haystack.

Examples

Example #1 A substr_compare() example

<?php
echo substr_compare("abcde""bc"12); // 0
echo substr_compare("abcde""de", -22); // 0
echo substr_compare("abcde""bcg"12); // 0
echo substr_compare("abcde""BC"12true); // 0
echo substr_compare("abcde""bc"13); // 1
echo substr_compare("abcde""cd"12); // -1
echo substr_compare("abcde""abc"51); // warning
?>

See Also

  • strncmp() - Binary safe string comparison of the first n characters

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