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The is_array() function checks whether a variable is an array or not. This function returns true (1) if the variable is an array, otherwise it returns false/nothing.
array_keys () - Return all the keys or a subset of the keys of an array. array_values () - Return all the values of an array. array_key_exists () - Checks if the given key or index exists in the array. in_array () - Checks if a value exists in an array.
array_search () - Searches the array for a given value and returns the first corresponding key if successful. isset () - Determine if a variable is declared and is different than null. array_key_exists () - Checks if the given key or index exists in the array.
array_is_list () - Checks whether a given array is a list. is_float () - Finds whether the type of a variable is float. is_int () - Find whether the type of a variable is integer. is_string () - Find whether the type of a variable is string.
In this tutorial, you will learn how to use the PHP in_array() function to check if a value exists in an array.
If you want to check if the given key or index exists in the array use array_key_exists <?php $search_array = array('first' => 1, 'second' => 4); if (array_key_exists('first', $search_array)) { echo "The 'first' element is in the array"; } ?>
PHP offers a few functions for validating and searching through arrays. Let's go through each of them. Checking for a value. Sometimes, you may need to verify a value exists within an array. The in_array() function in PHP is used to check if a certain value exists in an array. It'll return a boolean. TRUE if the value could be found.
