in_array() definition and usage_PHP tutorial-PHP Tutorial-php.cn

A basic tutorial for getting started with PHP. Friends in need can refer to it on how to use the in_array function.

bool in_array ( mixed $needle , array $haystack [, bool $strict ] )
Searches the haystack for needle and returns TRUE if found, FALSE otherwise.

If the value of the third parameter strict is TRUE, the in_array() function will also check whether the type of needle is the same as that in haystack.

Note:

If needle is a string, the comparison is case-sensitive.

Note:

Prior to PHP version 4.2.0, needle was not allowed to be an array.

Note: If the value parameter is a string and the type parameter is set to true, the search is case-sensitive.

Example #1 in_array() Example

The code is as follows

代码如下	复制代码
$os = array("Mac", "NT", "Irix", "Linux"); if (in_array("Irix", $os)) { echo "Got Irix"; } if (in_array("mac", $os)) { echo "Got mac"; } ?>

Copy code

$os = array("Mac", "NT", "Irix", "Linux");

if (in_array("Irix", $os)) {

echo "Got Irix";
}

if (in_array("mac", $os)) {

代码如下

复制代码

$a = array('1.10', 12.4, 1.13);

if (in_array('12.4', $a, true)) {
echo "'12.4' found with strict checkn";
}
if (in_array(1.13, $a, true)) {
echo "1.13 found with strict checkn";
}
?>

echo "Got mac";

}
?>

The second condition fails because in_array() is case sensitive, so the above program reads:

Got Irix

Example #2 in_array() strict type checking example

$a = array('1.10', 12.4, 1.13);

if (in_array('12.4', $a, true)) {

The code is as follows	Copy code

Related labels：

array php Instructions getting Started about function Can Base Tutorial have friend usage of

source：php.cn

Previous article：Usage of php list function_PHP tutorial Next article：Code of Conduct for Programmers_PHP Tutorial

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn