A brief discussion on PHP's in_array function to check whether a certain value exists in an array, a brief discussion on in_array

A brief talk about the in_array function in PHP to check whether a certain value exists in the array, a brief talk about in_array

PHP in_array() function checks whether a certain value exists in the array, and returns if it exists TRUE, otherwise returns FALSE.

Syntax:

bool in_array( mixed needle, array array [, bool strict] )

Parameter description:

参数	说明
needle	需要在数组中搜索的值，如果是字符串，则区分大小写
array	需要检索的数组
strict	可选，如果设置为 TRUE ，则还会对 needle 与 array 中的值类型进行检查

Example:

<&#63;php
$arr_a = array("a", "b", "c", 1);
if(in_array("a", $arr_a)){
  echo '字符 a 在 $arr_a 数组中存在';
} else {
  echo '字符 a 在 $arr_a 数组中不存在';
}
&#63;>

The example output results are as follows:

Example of strict check for character a in $arr_a array:

<&#63;php
$arr_a = array("a", "b", "c", 1);
if(in_array("1", $arr_a, TRUE)){
  echo '字符 1 在 $arr_a 数组中存在';
} else {
  echo '字符 1 在 $arr_a 数组中不存在';
}
&#63;>

The example output results are as follows:

Character 1 does not exist in the $arr_a array. Example of array as needle:

<&#63;php
$arr_a = array(array("a", "b"), 1, 2);
$arr_b = array("a", "b");
if(in_array($arr_b, $arr_a)){
	echo '数组 $arr_b 在 $arr_a 数组中存在';
} else {
	echo '数组 $arr_b 在 $arr_a 数组中不存在';
}
&#63;>

The example output results are as follows:

Array $arr_b exists in array $arr_a

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