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# substr_compare

(PHP 5)

substr_compare -- Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters

## Description

int substr_compare ( string main_str, string str, int offset [, int length [, bool case_sensitivity]])

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

Returns < 0 if main_str from position offset is less than str, > 0 if it is greater than str, and 0 if they are equal. If length is equal or greater than length of main_str and length is set, substr_compare() prints warning and returns `FALSE`.

If case_sensitivity is `TRUE`, comparison is case sensitive.

示範 1.A substr_compare() example

`<?php echo substr_compare("abcde", "bc", 1, 2); // 0 echo substr_compare("abcde", "bcg", 1, 2); // 0 echo substr_compare("abcde", "BC", 1, 2, true); // 0 echo substr_compare("abcde", "bc", 1, 3); // 1 echo substr_compare("abcde", "cd", 1, 2); // -1 echo substr_compare("abcde", "abc", 5, 1); // warning ?>`

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