How do delete value from array

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I am having array values and i want to delete the first_name from the all sub-array.
following is my array and some code which i perform but not get expected result.

What I have tried:

<pre>$a = array(
      array(
        'id' => 5698,
        'first_name' => 'Peter',
        'last_name' => 'Griffin',
      ),
      array(
        'id' => 4767,
        'first_name' => 'Ben',
        'last_name' => 'Smith',
      ),
      array(
        'id' => 3809,
        'first_name' => 'Joe',
        'last_name' => 'Doe',
      )
    );

function removeElementWithValue($array, $key){
    foreach($array as $subKey => $subArray)
    {
       // print_r($array);
        if($subArray[$key])
        {
            echo "hi";
            unset($array[$subKey]);
        }
    }
    print_r($array);
}
$data= removeElementWithValue($a, "first_name");

Posted 2-Apr-18 2:10am

Dipali Nigade

Updated 2-Apr-18 2:34am

v3

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Christiaan van Bergen · Accepted Answer · 2018-04-02T02:24:00

Solution 1

In your code you want to remove all arrays in the array $a that have an element with the key "first_name". You are not checking on the actual value. Try this:

PHP

function removeElementWithKey($array, $keyToRemove){
    foreach($array as $subArray)
    {
		foreach(array_keys($subArray) as $keyIndex => $key)
		{
			if ($key == $keyToRemove) 
            {
                array_splice($subArray, $keyIndex, 1);
            }
		}
    }
	return $array;
}
$data= removeElementWithKey($a, 'first_name');
print_r($data);

I used array_splice instead of unset(). This will leave your indexing in tact.
You can check the code here : PHP code- 39 lines - codepad[^]

Posted 2-Apr-18 2:24am

Christiaan van Bergen

Updated 2-Apr-18 4:20am

v3

Comments

Dipali Nigade 2-Apr-18 8:28am

no i want to remove first_name from array

Christiaan van Bergen 2-Apr-18 8:32am

What? Then why do you state your question as : "i want to delete the id from the all sub-array." ? This makes no sense.
Please improve your question!

Dipali Nigade 2-Apr-18 8:33am

yes sir i just improve that

Christiaan van Bergen 2-Apr-18 8:35am

So I see that you changed the function call as well. So you want to remove all key-value elements with the key "first_name"? Regardless of the actual value?

Dipali Nigade 2-Apr-18 8:41am

yes i want to remove all key-values elements with first_name

Patrice T 2-Apr-18 9:06am

It is a good idea to show the result you want.
Use Improve question to update your question.

Christiaan van Bergen 2-Apr-18 8:44am

There you go, I changed my answer. (Also I took the liberty to suggest another function name, you are no longer looking for a Value)

Dipali Nigade 2-Apr-18 8:55am

hello sir i change the code but giveing warning
Warning: Illegal string offset 'first_name' in D:\wamp\www\core_php_demo\array_demo.php on line 25

Christiaan van Bergen 2-Apr-18 10:20am

Thx for the heads up, this is the trouble with writing code in textboxes and not in anything where you can check it. I just updated the answer and added a link to codepad.org where you can run the code.