PHP in_array() 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:
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 Strictly checked example exists in $arr_a array:
<?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 Example of array as needle that 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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