PHP array_key_exists()

PHP array_key_exists() Function

PHP array_key_exists() is an inbuilt function in PHP and is used to check whether a specific key or index exists in the array or not. This function return boolean type value β€œTrue” or β€œFalse”. If specified key is found in the array, return the true otherwise false. To learn more about PHP Array Functions.

PHP array_key_exists() Syntax

boolean array_key_exists ($key, $array)

$key: This argument refers to the key that you want to search in given array.
$array: This argument refers to the array in which you want to search the given key β€œ$key”.

Return Value: This function will return the boolean type value β€œTrue” or β€œFalse”. It depends, key is exist in the array or not.

PHP Associative Array

<?php
$arr = array("naresh" => 15, "ankur" => 18);
$key = "naresh";

if (array_key_exists($key,$arr))
  {
  echo "Wow ! Key exists in Array";
  }
else
  {
  echo "Key does not exist!";
  }
?>

Output

Wow ! Key exists in Array

Example 2

<?php
$arr = array("james" => 15, "david" => 18);
$key = "smith";

if (array_key_exists($key,$arr))
  {
  echo "Wow ! Key exists in Array";
  }
else
  {
  echo "Key does not exist!";
  }
?>

Output

Key does not exist!

Indexed Array PHP

<?php
$arr = array("david","james","john","smith");
$key = 1;

if (array_key_exists($key,$arr))
  {
  echo "Wow ! Key exists in Array";
  }
else
  {
  echo "Key does not exist!";
  }
?>

Output

Wow ! Key exists in Array

Example 2

<?php
$arr = array("david","james","john","smith");
$key = 4;

if (array_key_exists($key,$arr))
  {
  echo "Wow ! Key exists in Array";
  }
else
  {
  echo "Key does not exist!";
  }
?>

Output

Key does not exist!

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