php key exists

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showing results for - "php key exists"
Serena
02 Jun 2019
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);
Mathilda
15 Aug 2017
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', $_POST)) {
17        button2();
18    }
19    function button1()
20    {
21        echo 'btn1 is clicked boom!';
22    }
23    function button2()
24    {
25        echo 'btn2 is clicked wohoo!';
26    }
27    ?>
28    <br><br>
29
30    <form action="" method="post">
31        <button name="btn1">click here</button>
32        <button name="btn2">click here</button>
33    </form>
34</body>
35</html>
Juliana
22 Mar 2017
1function findKey($array, $keySearch)
2{
3    foreach ($array as $key => $item) {
4        if ($key == $keySearch) {
5            echo 'yes, it exists';
6            return true;
7        } elseif (is_array($item) && findKey($item, $keySearch)) {
8            return true;
9        }
10    }
11    return false;
12}
13
Murray
14 Jul 2019
1PHP function key_exists($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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