Change value of PHP Array without using the keys

Question

Hello I am stuck modifying a value in a PHP array.

echo '<pre>';
print_r($data);
echo '</pre>';

I have to change this value :

I dont have to use to the keys : 900 and 2200 cause the values can change... How can I process to replace the first value "1578" by another in my $data array ?

Thanks a lot :)

do you have to replace the first value "1578" in just [900] or also in the first value "1578" in [1250], [1500], [1750] — mangart
– mangart, Commented Jun 17, 2021 at 11:53
Thanks for your answer. I need to change the first value of 900 without using 900 as a key — Be Weria
– Be Weria, Commented Jun 17, 2021 at 12:07

cbrr09 · Accepted Answer · 2021-06-17 12:10:34Z

1

You have to use nested loop.

foreach($data as $key => $value) {
  foreach( $value as $k => $v ) {
    if( $k === 0 ) {
        $data[$key][$k] = 'some value here';
    }
  }
}

answered Jun 17, 2021 at 12:10

cbrr09

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1 Comment

Be Weria Over a year ago

this is exactly what I was looking for, thank you

TrebuAB · Accepted Answer · 2021-06-17 11:55:28Z

0

You would change everytime the first value of your array or just the first "1578" of your array ?

If is the first case you can do : $data[900][array_key_first($data[900])] = $newValue;

Else you can search the key of the first 1578 and change it :

$key = array_search('1578', $data[900]);
$data[900][$key] = $newValue;

And if you want to change all the first 1578 in all your sub-array, loop on it

answered Jun 17, 2021 at 11:55

TrebuAB

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1 Comment

Be Weria Over a year ago

Thanks for your answer, as I said I need to change the first value of 900 but I cant use 900 as a key. by the way 1578 is not always the same value as well it can change too. I dont know if Im clear or not^^

Haim Evgi · Accepted Answer · 2021-06-17 12:13:20Z

0

make a loop on your array like:

foreach ($data as $key => $arr)
{
    $firstKey = array_search(1578, $arr);
    # replace
    if ($firstKey !== false)
        $data[$key][$firstKey] = "my new value";
}

edited Jun 17, 2021 at 12:13

answered Jun 17, 2021 at 12:06

Haim Evgi

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2 Comments

Be Weria Over a year ago

thanks, it might work but in my case I forgot to specify that 1578 is not a fixed value. it can change from one array to another

Haim Evgi Over a year ago

do you have a map like if the key is 900 then the value is 1578, etc... then use this map

mangart · Accepted Answer · 2021-06-17 12:24:58Z

0

You can use double foreach loop and than break immediately after you find the first value like this:

foreach($data as $key1 => $value1){
    foreach($data[$key1] as $key2 => $value2){
        $data[$key1][$key2] = $your_new_value;
        break 2;
    }
}

The 2 after the break statement means that you break out of both loops at the same time. Alternatively you can use array_keys which returns the keys of an array like this.

$key1 = array_keys($data)[0];
$key2 = array_keys($data[$key1])[0];
$data[$key1][$key2] = $your_new_value;

array_keys returns an array so the [0] at the end of the line means the first element of that array, because the first element of that array is usually the first key.

answered Jun 17, 2021 at 12:24

mangart

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