Replace substring in column values of a 2d array

Question

I'm trying to use str_replace() to remove the "my." out of the value4 elements in an array of arrays.

However, str_replace("my.", "", $myarray); isn't changing anything.

Does str_replace() not work on two-dimensional arrays?

My sample data and coding attempt:

$array = [
    [
        'value1' => 'John Doe',
        'value2' => 'Father',
        'value3' => '',
        'value4' => 'http://www.website.my.com'
    ],
    [
        'value1' => 'Jane Doe',
        'value2' => 'Mother',
        'value3' => '',
        'value4' => 'http://www.website.my.com'
    ]
    // ...
];
$out = str_replace('.my', '', $array);
var_export($out);

@MarkBaker It can also be used with arrays, just not multidimensional — Rizier123
– Rizier123, Commented Jun 4, 2015 at 15:13

Mark Baker · Accepted Answer · 2015-06-04 15:15:56Z

8

No, it works on strings, or single dimension arrays.... you could use it through the callback in an array_walk_recursive though

array_walk_recursive(
    $myarray,
    function (&$value) {
        $value = str_replace('.my', '', $value);
    }
);

edited Jun 4, 2015 at 15:15

answered Jun 4, 2015 at 15:14

Mark Baker

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1 Comment

Rizier123 Over a year ago

I'm not sure, but as I read the question he only wants to replace this on the key "value4": out of the value4 field of these arrays. But maybe OP has to write this clearer.

dognose · Accepted Answer · 2015-06-04 15:20:11Z

4

You can use array_walk_recursive() http://php.net/manual/en/function.array-walk-recursive.php to perform a replacement on every sub-element (Note: Callback is just triggered for leafs (non-arrays)):

$myArray = array(0 => "my.test", 2=> array("test" => "my.thing"));

array_walk_recursive($myArray, "removeMy");

function removeMy(&$element, $index){
   $element = str_replace("my.", "", $element);
}


print_r($myArray); // Array ( [0] => test [2] => Array ( [test] => thing ) )

if the replacement should only appear on value4 keys - add that as a condition:

function removeMy(&$element, $index){
  if ($index === "value4"){
       $element = str_replace("my.", "", $element);
  }
}

edited Jun 4, 2015 at 15:20

answered Jun 4, 2015 at 15:13

dognose

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3 Comments

n1nja Over a year ago

This ultimately ended up working for me. Only question is how would I write that changed value back to the array? This doesn't seem to do so.

n1nja Over a year ago

EDIT: Sorry, I typed your answer instead of copy and I missed the "&" before the $value. Thanks! So the "&" makes it write to the source array

dognose Over a year ago

@n1nja The & in front of a variable (for method input parameters) makes the variable containing just a reference on the original variable. Using $element without & will create a exact copy which you then can modify without changing the original array.

splash58 · Accepted Answer · 2015-06-04 15:31:38Z

2

Make it easy

foreach ($array as &$item)
   $item['value4'] = str_replace('my.', "", $item['value4']);

answered Jun 4, 2015 at 15:31

splash58

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Comments

mickmackusa · Accepted Answer · 2023-04-10 23:21:25Z

0

I agree with @splash58, there is no need for a recursive approach for your 2d array.

You can most directly access and mutate the specific column value using a foreach(). Declaring &$v in the loop signature ensures that any changes to that value are represented in the original array.

Code: (Demo)

foreach ($array as ['value4' => &$v]) {
    $v = str_replace("my.", "", $v);
}
var_export($array);

Of course the same can be done with whole rows, but your sample data indicates that only one column is meaningfully targeted. Anyhow, here is how you can use str_replace() to modify 1d arrays in the same fashion: (Demo)

foreach ($array as &$row) {
    $row = str_replace("my.", "", $row);
}
var_export($array);

answered Apr 10, 2023 at 23:21

mickmackusa♦

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