Detailed explanation of php in_array() checking whether a certain value exists in the array

PHP sometimes needs to determine whether a certain value exists in an array. We can directly use the PHP built-in function in_array() to realize the determination. The php in_array function is used to check whether a certain value exists in the array. If it exists, it returns true, otherwise it returns false. This article introduces the basic syntax and usage examples of the in_array function. Interested friends can refer to it.

php in_array() Check whether a certain value exists in the array

in_array Check whether a certain value exists in the array

Basic syntax ：

bool in_array(mixed $needle,array $haystack,bool $strict=FALSE)

Search needle

in haystack

Parameter introduction

Parameter	Description
needle	Required. Specifies the value to search for in the array. If it is a string, the comparison is case-sensitive.
haystack	Required. Specifies the array to search.
strict	Optional. If this parameter is set to true, the in_array() function also checks whether the type of needle is the same as that in haystack.

Return value

Returns TRUE if needle is found, otherwise returns FALSE.

Example:

<?php
$os = array(
  "Mac",
  "NT",
  "Irix",
  "Linux"
);
if (in_array("Irix", $os)) {
  echo "Got Irix";
}
if (in_array("mac", $os)) {
  echo "Got mac";
}
?>

The second condition of running online fails because in_array() is case-sensitive, so the above program is displayed as ：

Got Irix

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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