strncmp

(PHP 4, PHP 5, PHP 7, PHP 8)

strncmp — Binary safe string comparison of the first n characters

Опис

strncmp(string $string1, string $string2, int $length): int

This function is similar to strcmp(), with the difference that you can specify the (upper limit of the) number of characters from each string to be used in the comparison.

Note that this comparison is case sensitive.

Параметри

string1: The first string.
string2: The second string.
length: Number of characters to use in the comparison.

Значення, що повертаються

Returns a value less than 0 if string1 is less than string2; a value greater than 0 if string1 is greater than string2, and 0 if they are equal. No particular meaning can be reliably inferred from the value aside from its sign.

Журнал змін

Версія	Опис
8.2.0	Тепер ця функція повертає `-1` або `1`, а не від'ємне або додатнє число, як раніше.

Приклади

Приклад #1 strncmp() example

<?php

$var1 = 'Hello John';
$var2 = 'Hello Doe';
if (strncmp($var1, $var2, 5) === 0) {
    echo 'First 5 characters of $var1 and $var2 are equal in a case-sensitive string comparison';
}
?>

Прогляньте також

strncasecmp() - Binary safe case-insensitive string comparison of the first n characters
preg_match() - Perform a regular expression match
substr_compare() - Binary safe comparison of two strings from an offset, up to length characters
strcmp() - Binary safe string comparison
strstr() - Find the first occurrence of a string
substr() - Return part of a string