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php check if a value exists in array
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- 2018-04-26 10:28:285047browse
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PHP in_array() The function checks whether a certain value exists in the array. If it exists, it returns TRUE, otherwise it returns FALSE.
Syntax:
bool in_array( mixed needle, array array [, bool strict] )
Parameter description:
| Parameter | Description |
|---|---|
| needle | The value that needs to be searched in the array, if it is a string, it is case-sensitive |
| array | Array to be retrieved |
| strict | Optional, if set to TRUE, the value types in needle and array will also be checked |
Example:
<?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';
}
?>Character a exists in $arr_a array Strictly checked example:
<?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';
}
?>Character 1 in $ Example of array as needle does not exist in arr_a array:
<?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 $arr_a 数组中不存在';
}
?>array$arr_b exists in $arr_a array
PHP in_array() The function checks whether a certain value exists in the array. If it exists, it returns TRUE, otherwise it returns FALSE.
Syntax:
bool in_array( mixed needle, array array [, bool strict] )
Parameter description:
| Parameter | Description |
|---|---|
| needle | The value that needs to be searched in the array, if it is a string, it is case-sensitive |
| array | Array to be retrieved |
| strict | Optional, if set to TRUE, the value types in needle and array will also be checked |
Example:
<?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';
}
?>Character a exists in the $arr_a array Strictly checked example:
<?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';
}
?>Character 1 in $ Example of array as needle does not exist in arr_a array:
<?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 $arr_a 数组中不存在';
}
?>array$arr_b exists in $arr_a array
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