Detailed explanation of the steps for searching array key names using the array_key_exists() function

This time I bring you array_key_exists()FunctionSearch Detailed explanation of the steps of array key name, array_key_exists() function to search array key name What are the precautions? The following is a practical case, let’s take a look.

array_key_exists() Definition and usage
array_key_exists() function determines whether the specified key exists in an array. If the key exists, it returns true, otherwise it returns false.

Syntax

array_key_exists(key,array)

Parameter Description
key Required. Specifies the key name.
array required. Specifies the input array.

Example 1, php array function array_key_exists().

<?php 
$a=array("a"=>"Dog","b"=>"Cat"); 
if (array_key_exists("a",$a)) 
{ 
echo "Key exists!"; 
} 
else 
{ 
echo "Key does not exist!"; 
} 
?>

Output:
Key exists!

Example 2, PHP array function array_key_exists().

<?php 
$a=array("a"=>"Dog","b"=>"Cat"); 
if (array_key_exists("c",$a)) 
{ 
echo "Key exists!"; 
} 
else 
{ 
echo "Key does not exist!"; 
} 
?>

Output:
Key does not exist!

Example 3, PHP array function array_key_exists().

<?php 
$a=array("Dog",Cat"); 
if (array_key_exists(0,$a)) 
{ 
echo "Key exists!"; 
} 
else 
{ 
echo "Key does not exist!"; 
} 
?>

Output:
Key exists!

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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