The array_key_exists() function checks an array for a specified key, and returns true if the key exists and false if the key does not exist.
Tip: Remember that if you skip the key when you specify an array, an integer key is generated, starting at 0 and increases by 1 for each value. (See example 2)
array_key_exists(key,array)
Parameter | Description |
---|---|
key | Required. Specifies the key |
array | Required. Specifies an array |
<?php
$a=array("Volvo"=>"XC90","BMW"=>"X5");
if (array_key_exists("Volvo",$a))
{
echo "Key exists!";
}
else
{
echo "Key does not exist!";
}
?>
$a=array("Volvo"=>"XC90","BMW"=>"X5");
if (array_key_exists("Volvo",$a))
{
echo "Key exists!";
}
else
{
echo "Key does not exist!";
}
?>
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