php unset not working in foreach for array

Question

Server nginx+php-fpm php 7.2

I tried http://sandbox.onlinephpfunctions.com/code/200d19b2663ee01391b9d0a1745ab677b3f219df

$accounts = [
    0 => [
        "active" => true    
    ],
    1 => [
        "active" => false    
    ]
];

foreach($accounts as &$value) {

    if($value['active'] === false) {
         var_dump($value);
         unset($value);
    }

}
unset($value);

print_r($accounts);

But unset not working. If use $value = null; in cycle then will set fine.

Thas because you are unsetting $accounts[1]['active'] and not $accounts[1] — RiggsFolly
– RiggsFolly, Commented Jul 18, 2019 at 11:11

RiggsFolly · Accepted Answer · 2019-07-18 11:15:42Z

1

Solution

$accounts = [
        0 => [
            "active" => true    
        ],
        1 => [
            "active" => false    
        ]
];

foreach($accounts as $index=>$value) {

    if($value['active'] === false) {
        var_dump($value);
        unset($accounts[$index]);
    }

}
//unset($value);

print_r($accounts);

edited Jul 18, 2019 at 11:15

RiggsFolly

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answered Jul 18, 2019 at 11:07

Jimit H.

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4 Comments

SiD quakers Over a year ago

Fine, but why not working directly modify with & Can explain?

RiggsFolly Over a year ago

Because when you unset($value); you are unsetting $accounts[1]['active'] and not $accounts[1]

Jimit H. Over a year ago

because foreach return each part of array

Jimit H. Over a year ago

codeburst.io/… and tutorialspoint.com/php/php_loop_types refrence link

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