array key exists in php

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Niall
22 Jan 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", $fruits);
source
Max
08 Jan 2021
1
2<?php
3$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
Matteo
20 Jul 2019
1<!DOCTYPE html>
2<html lang="en">
3
4<head>
5    <meta charset="UTF-8">
6    <meta http-equiv="X-UA-Compatible" content="IE=edge">
7    <meta name="viewport" content="width=device-width, initial-scale=1.0">
8    <title>Document</title>
9</head>
10
11<body>
12    <?php
13    if (array_key_exists('btn1', $_POST)) {
14        button1();
15    }
16    if (array_key_exists('btn2', $_POST)) {
17        button2();
18    }
19    function button1()
20    {
21        echo 'btn1 is clicked boom!';
22    }
23    function button2()
24    {
25        echo 'btn2 is clicked wohoo!';
26    }
27    ?>
28    <br><br>
29
30    <form action="" method="post">
31        <button name="btn1">click here</button>
32        <button name="btn2">click here</button>
33    </form>
34</body>
35</html>
Lotta
26 Jan 2016
1PHP function key_exists($key, array $array) bool
2------------------------------------------------
3Checks if the given key or index exists in the array. The name of this function is array_key_exists() in PHP > 4.0.6.
4
5Parameters:
6int|string--$key--Value to check.
7array--$array--An array with keys to check.
8  
9Returns:true on success or false on failure.
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