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

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

in_array checks whether a certain value exists in the array

Basic grammar:

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

Search needle in haystack

Parameter introduction

Parameters	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:

<&#63;php
$os = array(
  "Mac",
  "NT",
  "Irix",
  "Linux"
);
if (in_array("Irix", $os)) {
  echo "Got Irix";
}
if (in_array("mac", $os)) {
  echo "Got mac";
}
&#63;>

Running the second condition online fails because in_array() is case-sensitive, so the above program displays:

Got Irix

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