How to unset some elements of JSON Array in php

Question

I'm trying to unset some elements of JSON Array, so if pname value start with XX it should unset. Normal JSON String gives me this

$json = str_replace('&quot;', '"', $loc);

[{"uid":"352","pcode1":"AB1","pname":"XXAB1"},....}]

If I hardcode pname value like this

foreach ($json as $key => $value) 
     {
        if (in_array('XXAB1', $value)) {
                unset($json[$key]);
            }
    }
    $j = json_encode($json);
    echo $j;

it works unsets that array but how can I do this dynamically ? So that each pname value begins with XX can be unsets.

Narendrasingh Sisodia · Accepted Answer · 2015-10-26 13:26:26Z

2

You can use preg_match like as

if(preg_match('/^[X]{2}/',$value['pname'])){
    unset($json[$key]);
}

Demo

edited Oct 26, 2015 at 13:26

answered Oct 26, 2015 at 13:10

Narendrasingh Sisodia

21.4k6 gold badges51 silver badges54 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Tony Over a year ago

Thanks for your reply, I've tried your suggestion instead of in_array() but not having much luck.

Tony Over a year ago

If I don't use json_decode($json,true); it works, very strange. final code that worked

$json = str_replace('&quot;', '"', $loc);		  	foreach ($json as $key => $value)  	{  		if(preg_match('/^[X]{2}/',$value['pname'])){  			unset($json[$key]);  		}  	}  	$j = json_encode($json);  	echo $j;

Thank you very much

steadweb · Accepted Answer · 2015-10-26 13:51:32Z

1

Within your foreach, you could use strpos to determine whether XX resides at the beginning of the string.

Using === strictly checks that 0 is returned and not false

<?php

$json = json_decode('[{"uid":"352","pcode1":"AB1","pname":"XXAB1"},{"uid":"352","pcode1":"AB1","pname":"XAB1"}]',true);

foreach ($json as $key => $value) {
    if(strpos($value['pname'], 'XX') === 0) {
        unset($json[$key]);
    }
}

$j = json_encode($json);
echo $j;

print_r($json);

https://3v4l.org/hZLDP

edited Oct 26, 2015 at 13:51

answered Oct 26, 2015 at 13:37

steadweb

16.8k3 gold badges39 silver badges54 bronze badges

Collectives™ on Stack Overflow

How to unset some elements of JSON Array in php

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related