Retrieving All Keys from an Array in PHP

Q

How To Get All the Keys Out of an Array in PHP?

✍: FYIcenter.com

A

Function array_keys() returns a new array that contains all the keys of a given array. Here is a PHP script on how to use array_keys():

<?php 
$mixed = array();
$mixed["Zero"] = "PHP";
$mixed[1] = "Perl";
$mixed["Two"] = "Java";
$mixed["3"] = "C+";
$mixed[""] = "Basic";
$mixed[] = "Pascal";
$mixed[] = "FORTRAN";
$keys = array_keys($mixed);
print("Keys of the input array:\n");
print_r($keys);
?>

This script will print:

Keys of the input array:
Array
(
    [0] => Zero
    [1] => 1
    [2] => Two
    [3] => 3
    [4] =>
    [5] => 4
    [6] => 5
)

⇒ Retrieving All Values from an Array in PHP

⇐ Finding a Given Value in an Array in PHP

⇑ PHP Built-in Functions for Arrays

⇑⇑ PHP Tutorials

2017-01-21, ∼2621🔥, 0💬

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PHP Built-in Functions for Arrays
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Sorting an Array by Values in PHP
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Retrieving All Values from an Array in PHP
How To Get All the Values Out of an Array in PHP? Function array_values() returns a new array that contains all the values of a given array. Here is a PHP script on how to use array_values(): <?php $mixed = array(); $mixed["Zero"] = "PHP"; $mixed[1] = "Perl"; $mixed["Two"] = "Java"; $mixed["3... 2017-01-21, ∼3015🔥, 0💬

Merging Two Arrays into a Single Array in PHP
How To Merge Values of Two Arrays into a Single Array in PHP? You can use the array_merge() function to merge two arrays into a single array. array_merge() appends all pairs of keys and values of the second array to the end of the first array. Here is a PHP script on how to use array_merge(): &l... 2017-01-11, ∼2983🔥, 0💬

Counting the Number of Values in an Array in PHP
How To Get the Total Number of Values in an Array in PHP? You can get the total number of values in an array by using the count() function. Here is a PHP example script: <?php $array = array("PHP", "Perl", "Java"); print_r("Size 1: ".count($array)."\n"); $array = array(); print_r("Size 2: ".c... 2017-01-29, ∼2968🔥, 0💬

Sorting an Array by Keys in PHP
How To Sort an Array by Keys in PHP? Sorting an array by keys can be done by using the ksort() function. It will re-order all pairs of keys and values based on the alphanumeric order of the keys. Here is a PHP script on how to use ksort(): <?php $mixed = array(); $mixed["Zero"] = "PHP"; $mixe... 2017-01-21, ∼2886🔥, 0💬

Finding a Given Value in an Array in PHP
How To Find a Specific Value in an Array in PHP? There are two functions can be used to test if a value is defined in an array or not: array_search($value, $array) - Returns the first key of the matching value in the array, if found. Otherwise, it returns false. in_array($value, $array) - Returns tr... 2017-01-21, ∼2791🔥, 0💬

Retrieving All Keys from an Array in PHP
How To Get All the Keys Out of an Array in PHP? Function array_keys() returns a new array that contains all the keys of a given array. Here is a PHP script on how to use array_keys(): <?php $mixed = array(); $mixed["Zero"] = "PHP"; $mixed[1] = "Perl"; $mixed["Two"] = "Java"; $mixed["3"] = "C+... 2017-01-21, ∼2622🔥, 0💬

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