Php Array Key Exists Function
What is array_key_exists Function?
Explanation
The "array_key_exists" function checks if the given key or index exists in the array.
array_key_exists(key, array)
In the above syntax the "key" is checked for in the "array". The function returns "true" if the key is present, and "false" otherwise.
<?php
$a = array('apple' => 1, 'guava' => 4);
if (array_key_exists('apple', $a))
{
echo "The Key 'apple' exists";
}
else
{
echo "The Key 'apple' does'nt exists";
}
}
?> Result :
The Key 'apple' exists
In the above example the array "$a", is checked for the key 'first', since present it displays the message.
Syntax:
array_key_exists(key, array)
In the above syntax the "key" is checked for in the "array". The function returns "true" if the key is present, and "false" otherwise.
Example :
<?php
$a = array('apple' => 1, 'guava' => 4);
if (array_key_exists('apple', $a))
{
echo "The Key 'apple' exists";
}
else
{
echo "The Key 'apple' does'nt exists";
}
}
?>
The Key 'apple' exists
In the above example the array "$a", is checked for the key 'first', since present it displays the message.
