php 한글 메뉴얼 도움말 검색 사이트 Binary safe comparison of two strings from an offset, up to length characters [function.substr-compare]

설명

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

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

인수

main_str: The main string being compared.
str: 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 str compared to the length of main_str less the offset.
case_insensitivity: If case_insensitivity is TRUE, comparison is case insensitive.

반환값

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 offset is equal to or greater than the length of main_str, or the length is set and is less than 1 (prior to PHP 5.6), substr_compare() prints a warning and returns FALSE.

변경점

버전	설명
5.6.0	`length` may now be 0.
5.1.0	Added the possibility to use a negative `offset`.

예제

Example #1 A substr_compare() example


<?php
echo substr_compare("abcde", "bc", 1, 2); // 0
echo substr_compare("abcde", "de", -2, 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
?>

참고

strncmp() - 처음 n 문자의 바이너리 안전 문자열 비교