How to keep an identical array key PHP [duplicate]

Question

Could anyone let me know how can I allow duplicate keys in php array? I have already read all identical posts concerning this questions and it does not answer my question.

In the following example, I want to pass the second 'separator' key without rename it.

$data = [ 'username' => array( 'type' => 'checkbox', 'id' => 'username', 'label' => 'Show Username Field', 'default' => true, ), 'separator' => array( 'type' => 'separator', 'height' => 'thin' ), 'heading' => array( 'type' => 'textarea', 'id' => 'heading', 'label' => 'Heading Text', 'default' => '', ), 'separator' => array( 'type' => 'separator', 'height' => 'thin' ), 'placeholder' => array( 'type' => 'text', 'id' => 'placeholder', 'label' => 'Placeholder Text', 'default' => 'Your name', ), ]; echo '<pre>'; print_r($data); echo '</pre>';

And when you request $data['separator'] - which value should be returned? — u_mulder
– u_mulder, Commented Dec 16, 2017 at 8:17
And if you have type in subarray - why do you need a key then? Use zero-based indexed array. — u_mulder
– u_mulder, Commented Dec 16, 2017 at 8:18
and the print_r($data); it returning only the first 'separator' — Mustapha Fersaoui
– Mustapha Fersaoui, Commented Dec 16, 2017 at 8:24

Jacob Oettinger · Accepted Answer · 2017-12-16 08:32:58Z

That cannot be done in the way you are trying to do it. The array key is what identifies the entry in the array. You can only have one element with the same key. So in your example your second element with the separator key is overwriting the first element.

So you have to solve it in some other way. One way would be to not use explicit keys and just us numeric indexes. You already have your key value as the id field in each of your array entries.

That would look something like this:

$data = [ array( 'type' => 'checkbox', 'id' => 'username', 'label' => 'Show Username Field', 'default' => true, ), array( 'type' => 'separator', 'height' => 'thin' ), array( 'type' => 'textarea', 'id' => 'heading', 'label' => 'Heading Text', 'default' => '', ), array( 'type' => 'separator', 'height' => 'thin' ), array( 'type' => 'text', 'id' => 'placeholder', 'label' => 'Placeholder Text', 'default' => 'Your name', ), ]; echo '<pre>'; print_r($data); echo '</pre>';

You would have to loop through the entries to find a specific element. But if you are generating html from the data, I guess you are looping through it anyway.

RamC · Accepted Answer · 2017-12-16 08:32:27Z

It is not possible to have identical keys in an associative array.

If identical keys are given, it gets overridden.

From your data, I assume you are trying to render a form.

Based on that, below are my suggestions.

Move the key name inside the array and utilize it.

Example

$data = [ [ 'key_name' => 'username', 'type' => 'checkbox', 'id' => 'username', 'label' => 'Show Username Field', 'default' => true, ], [ 'key_name' => 'separator', 'type' => 'separator', 'height' => 'thin' ], [ 'key_name' => 'heading', 'type' => 'textarea', 'id' => 'heading', 'label' => 'Heading Text', 'default' => '', ], [ 'key_name' => 'separator', 'type' => 'separator', 'height' => 'thin' ], [ 'key_name' => 'placeholder', 'type' => 'text', 'id' => 'placeholder', 'label' => 'Placeholder Text', 'default' => 'Your name', ], ];

Or if you still want the key name in the same order, have it as array of arrays.

Example

$data = [ [ 'username' => [ 'type' => 'checkbox', 'id' => 'username', 'label' => 'Show Username Field', 'default' => true, ], ], [ 'separator' => [ 'type' => 'separator', 'height' => 'thin' ], ], [ 'heading' => [ 'type' => 'textarea', 'id' => 'heading', 'label' => 'Heading Text', 'default' => '', ], ], [ 'separator' => [ 'type' => 'separator', 'height' => 'thin' ], ], [ 'placeholder' => [ 'type' => 'text', 'id' => 'placeholder', 'label' => 'Placeholder Text', 'default' => 'Your name', ], ] ];

this probably works. in my example the key_name is same as id name, so i had used the example from Jacob Oettinger. Thank you!
I maked an id only for fields that contain an value, the separator is only for appearance. so the separator id it will be predifined in the function.

Kumar Praveen · Accepted Answer · 2017-12-16 08:25:36Z

Array is in wrong format initilize array as given below.

$data = [ 'username' => array( 'type' => 'checkbox', 'id' => 'username', 'label' => 'Show Username Field', 'default' => true, ), 'separator' => array( array( 'type' => 'separator', 'height' => 'thin' ), array( 'type' => 'separator', 'height' => 'thin' ) ), 'placeholder' => array( 'type' => 'text', 'id' => 'placeholder', 'label' => 'Placeholder Text', 'default' => 'Your name', ), ]; echo '<pre>'; print_r($data); echo '</pre>

I want to construct a html form with this, so the keys order is important. I want to separate every field with a 'separator'. I dont know if this work. I must to test it. thanks!
yes you can . change above code according to your requierment.

Collectives™ on Stack Overflow

How to keep an identical array key PHP [duplicate]

3 Answers 3

Comments

3 Comments

2 Comments

Linked

Hot Network Questions