Check if the key "Volvo" exists in an array:
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)
Parameter | Description |
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key | Required. Specifies the key |
array | Required. Specifies an array |
Return Value: | Returns TRUE if the key exists and FALSE if the key does not exist |
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PHP Version: | 4.0.7+ |
Check if the key "Toyota" exists in an array:
Check if the integer key "0" exists in an array: