php key in array exists

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showing results for - "php key in array exists"
Ousmane
15 Mar 2018
1// Here's our fruity array
2$fruits = ['apple', 'pear', 'banana'];
3
4// Use it in an `if` statement
5if (array_key_exists("banana", $fruits)) {
6 // Do stuff because `banana` exists
7}
8
9// Store it for later use
10$exists = array_key_exists("peach", $fruits);
Matthew
29 Aug 2019
1
2<?php
3$search_array array('first' => null'second' => 4);
4
5// returns false
6isset($search_array['first']);
7
8// returns true
9array_key_exists('first'$search_array);
10?>
11
12
Flavie
02 Jul 2017
1<?php
2
3// The values in this arrays contains the names of the indexes (keys) 
4// that should exist in the data array
5$required = array('key1', 'key2', 'key3');
6
7$data = array(
8    'key1' => 10,
9    'key2' => 20,
10    'key3' => 30,
11    'key4' => 40,
12);
13
14if (count(array_intersect_key(array_flip($required), $data)) === count($required)) {
15    // All required keys exist!
16}
17
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