Replace one arrays keys with another arrays values in php

Question

I want to map form fields to database fields.

I have two arrays..

One array is the data and contains the form field id as the key and the form field value as the value.

$data = array("inputEmail"=>"[email protected]","inputName"=>"someone"... etc

I also have an array which i intended to use as a map. The keys of this array are the same as the form fields and the values are the database field names.

$map = array("inputEmail"=>"email", "inputName"=>"name"... etc

What i want to do is iterate over the data array and where the data key matches the map key assign a new key to the data array which is the value of the map array.

$newArray = array("email"=>"[email protected]", "name"=>"someone"...etc

My question is how? Ive tried so many different ways im now totally lost in it.

Why not simply having the same names across the application? ;) — hek2mgl
– hek2mgl, Commented Mar 31, 2013 at 22:51
The input field names are important for the form validation to work. But i know what you mean. I thought this would be simpler than changing the whole applications input field names and also the validation script. — Aparistar
– Aparistar, Commented Mar 31, 2013 at 22:55
If I could give an advice: Try to use the same names across application if any possible. You'll be saved from many, many headaches. Also it is good for automatic code generation and so on... — hek2mgl
– hek2mgl, Commented Mar 31, 2013 at 22:58

Sam Lanning · Accepted Answer · 2013-03-31 22:59:06Z

12

This is made quite nice with a foreach loop

foreach( $data as $origKey => $value ){
  // New key that we will insert into $newArray with
  $newKey = $map[$origKey];
  $newArray[$newKey] = $value;
}

A more condensed approach (eliminating variable used for clarification)

foreach( $data as $origKey => $value ){
  $newArray[$map[$origKey]] = $value;
}

answered Mar 31, 2013 at 22:59

Sam Lanning

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Imran Zahoor · Accepted Answer · 2016-08-24 10:42:42Z

10

If you want to replace keys of one array with values of the other the solution is array_combine

<?php
$a = array('green', 'red', 'yellow');
$b = array('avocado', 'apple', 'banana');
$c = array_combine($a, $b);

print_r($c);
?>

print_r output

Array
(
    [green]  => avocado
    [red]    => apple
    [yellow] => banana
)

edited Aug 24, 2016 at 10:42

answered Jun 26, 2014 at 15:21

Imran Zahoor

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4 Comments

Sam Lanning Over a year ago

array_combine does not do what the user is after in this instance.

Imran Zahoor Over a year ago

@SamLanning as per the title Replace one arrays keys with another arrays values in php the above answer is correct so better not to negative rate it. As it can help people who want to replace keys of one array with values of the other.

99linesofcode Over a year ago

array_combine() expects both arrays to be of equal length. One cannot assume that is the case here.

Mirgen Over a year ago

This is awsome solutions. Easiest. Should have been acepted. Thank you

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