array_push changes the values

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array_push changes the values

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#1 by (1 votes)
#2 by (0 votes)

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As you can see in the example array_push or array_unshift save [data] with the last value.

<?php
$filters   = json_decode(strtolower('{"groupOp":"AND","rules":[{"field":"codigo","op":"cn","data":"ampolla 213"},{"field":"codigo","op":"cn","data":"hola rzD"}]}'));
        if (count(explode(' ', preg_replace("/\s+/", " ", $filters->rules[0]->data)))>1) {
            $tmp_array = $filters->rules[0];
            array_shift($filters->rules);

            unset($tmp_array->data);
            foreach(explode(' ', preg_replace("/\s+/", " ", $filters->rules[0]->data)) as &$value) {
                $tmp_array->data = $value;
                print_r($tmp_array);
                array_unshift($filters->rules, $tmp_array);
            }
            print_r($filters);
        }

Output

stdClass Object
(
    [field] => codigo
    [op] => cn
    [data] => hola
)
stdClass Object
(
    [field] => codigo
    [op] => cn
    [data] => rzd
)
stdClass Object
(
    [groupop] => and
    [rules] => Array
        (
            [0] => stdClass Object
                (
                    [field] => codigo
                    [op] => cn
                    [data] => rzd
                )

            [1] => stdClass Object
                (
                    [field] => codigo
                    [op] => cn
                    [data] => rzd
                )

php array object

asked by John Vargas 27.11.2017 в 13:12

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2 answers

0

Thanks for your comment, I was researching a lot before asking (I had to go through json_enconde (, TRUE) and I did not have these problems.

Greetings.

answered by 29.11.2017 в 01:33

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score 1 · Accepted Answer

When you change the value of $tmp_array->data you are affecting all the occurrences of that stdClass object contained in the $filters->rules array, because that object that you insert ("prependeas") in the array with array_unshift passes < strong> by reference .

This is in the documentation :

As of PHP 5, an object variable does not contain the object itself value anymore It only contains an object identifier that allows object accessors to find the current object. When an object is sent by argument, returned or assigned to another variable, the different variables are not aliases: they hold a copy of the identifier, which points to the same object .

This you could try with a simpler example:

<?php

$rules=[];
$objeto=new stdClass();

$objeto->data='valor 0';
$rules[] = $objeto;

$objeto->data='valor 1';
$rules[] = $objeto;

$objeto->data='valor 2';
$rules[] = $objeto;

print_r($rules);

(You can see it in link )

If you would like to modify the value inserted in each loop, you would have to create a new object or clone the previous one:

<?php

$rules=[];
$objeto=new stdClass();

$objeto->data='valor 0';
$rules[] = $objeto;

$objeto = clone $objeto;
$objeto->data='valor 1';
$rules[] = $objeto;

$objeto = clone $objeto;
$objeto->data='valor 2';
$rules[] = $objeto;

print_r($rules);

(See link )