Usage and examples of PHP in_array() function

PHP Array Function Manual

The in_array() function checks if a specified value exists in an array

Syntax

in_array ( $value, $array [,$strict] );

Definition and usage

The in_array() function searches for a specific value in an array. If the third parameterstrictSet to TRUE, then the in_array() function will also check the type of $value.

Note:If value is a string, the comparison is case-sensitive.

Parameter

Return value

If the value is found in the array, this function returns TRUE, otherwise it returns FALSE.

Online example: Find string

<?php
　　　$mobile_os = array("Mac", "android", "java", "Linux");
　　　
　　　if (in_array("java", $mobile_os)) {
　　　　　　echo "Got java";
　　　}
　　　
　　　if (in_array("mac", $mobile_os)) {
　　　　　　echo "Got mac";
　　　}
?>

Output result:

Got java

The first condition is successful, returns true and outputs the result; while the second condition fails because in_array() is case-sensitive, and there is no lowercase 'mac' in the array.

Online example: Find array

Find another array in the array

<?php
$a = array(array('p', 'h'), array('p', 'r'), 'o');
if (in_array(array('p', 'h'), $a)) {
　　　　echo "'ph' was found\n";
}
if (in_array(array('f', 'i'), $a)) {
　　　　echo "'fi' was found\n";
}
if (in_array('o', $a)) {
　　　　echo "'o' was found\n";
}
?>

Output result:

'ph' was found
'o' was found

　 PHP Array Function Manual