PHP determines whether a value exists in an array

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

Syntax: (Recommended learning: PHP programming from entry to proficiency)

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

Parameter description:

needle, the value that needs to be searched in the array, if it is a string, it is case sensitive

array, the array that needs to be retrieved

strict, optional, if set Is TRUE, the value type in needle and array will also be checked

Example:

<?php
$arr_a = array("a", "b", "c", 1);
if(in_array("a", $arr_a)){
  echo &#39;字符 a 在 $arr_a 数组中存在&#39;;
} else {
  echo &#39;字符 a 在 $arr_a 数组中不存在&#39;;
}
?>

Character a exists in the $arr_a array Strict check Example:

<?php
$arr_a = array("a", "b", "c", 1);
if(in_array("1", $arr_a, TRUE)){
  echo &#39;字符 1 在 $arr_a 数组中存在&#39;;
} else {
  echo &#39;字符 1 在 $arr_a 数组中不存在&#39;;
}
?>

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