Php array contains key like array_key_exists() devuelve true si la key dada existe en el array. La key puede ser cualquier valor all given keys a,b,c exists in the supplied array. 1 If an associative array is used as the second parameter of array_fill_keys, then the associative array will be appended in all the values of the first array. 2 This sorts the array by noticia field in DESC order using uasort() function: function fn($a, $b) { if ($a['fetcha'] == $b['fetcha']). 3 First, I need to convert a key that contains an array into an element of that same array. In order to do that, I need to find the key's name. 4 $keys = array_keys ($array); $found = false; foreach ($keys as $key) { //If the key is found in your string, set $found to true if (preg_match ("/".$key."/", "I like cats")) { $found = true; } } EDIT: As said in comment, strpos could be better! So using the same code, you can just replace preg_match. 5 1. I am using array_key_exists on an associative array to detect if a key exists like this if (array_key_exists ('Packaged price (£)', $item)) { echo 'The Key Exists'; } This works fine, but I want to modify it so that it checks if the key has packaged in the name. 6 If you're creating an array yourself and then using in_array to search it, consider setting the keys of the array and using isset instead since it's much faster. 'apple', 'banana' => 'banana', 'orange' => 'orange');. 7 array_key_exists — Checks if the given key or index exists in the array Description ¶ array_key_exists (string|int $key, array $array): bool array_key_exists () returns true if the given key is set in the array. key can be any value possible for an array index. Parameters ¶ key Value to check. array An array with keys to check. Return Values ¶. 8 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 below) Syntax array_key_exists (key, array). 9 array_intersect () returns an array containing all the values of array that are present in all the arguments. Note that keys are preserved. Parameters ¶ array The array with master values to check. arrays Arrays to compare values against. Return Values ¶. array_search php 10 In a high-voted example, an array is given that contains, amongst other things, If you found yourself in need of a multidimensional array in_array like. 11 php get value from array by key 12