How to Check if a Value Exists in an Array in PHP

How to check if a value exists in an array in PHP. PHP provides a couple of inbuilt method such as in_array(), array_search() through which we can check if a value exists in an array or not. Apart from using inbuilt PHP methods, we’ll write our own custom method to check if a value exists in an array in PHP.

How to Check If a Value Exists in an Array in PHP

How to Check If a Value Exists in an Array in PHP

Let’s check how to solve this problem using PHP inbuilt method as well as our own custom function.

PHP in_array() method to Check If  a Value Exists in an Array in PHP

PHP in_array() method check if a value exists in an array, It returns true if a value exists otherwise false.

Syntax –

1. Let’s first take the case of a simple array.

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How to Check if a value exists in an Associative array in PHP

In above example, we have used in_array() method for a simple array. Let’s check in_array() method for an associative array.

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PHP array_search() method to check if a value exists in an array in PHP

PHP array_search() method search an array for given value and return the corresponding key if a value exists in an array. If a value doesn’t exist in an array then it returns NULL.

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Syntax –

if strict is set to true which is false by default, then it searches for an identical element (strict type checking). In PHP, Strict type comparison is done through triple equal to (===).

Difference between double and triple equals to in PHP

PHP Function to check if a value exists in an array

In above example, We have learned PHP inbuilt functions to check if a value exists in an array. Let’s create our own custom function which takes two arguments ( array and the value to be searched).  It compares the value to each element of an array.

Linear Search Algorithm.

Conclusion

I have explained all the methods which I used to check if a value exists in an array. If you know any other method then you can let us know through your comments.

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