如何从字符串中爆炸数组？

I want to create an array from this string, stored in database:

$string = '"2148" => "50","2050" => "2","2403" => "1"';
$id_values = explode('=> "', $string);
foreach($id_values as $id => $value)
{
    $value_to_print .= '<img src="images/item_values/'.$id.'.gif"> - '.$value.'';
}

echo $value_to_print;

Manually defining the array works as expected:

$id_values = array("2148" => "50","2050" => "2","2403" => "1");

$id isn't going to be the number from the original string - it will create a new one.

You could try this:

$string = '"2148" => "50","2050" => "2","2403" => "1"';
$id_values = array();
$bits = explode(",", $string);
foreach ($bits as $b) {
    $bobs = explode(" => ", $b);
    $id_values[$bobs[0]] = $bobs[1];
}
foreach($id_values as $id => $value){
    $value_to_print .= '<img src="images/item_values/'.$id.'.gif"> - '.$value.'';
}

That's untested but it should be fine.

In the future, use json_encode and json_decode to store and retrieve arrays.

Note: You probably want to get rid of the quotes too - just add

$b = str_replace('"', '', $b);

on the line before $bobs = explode(" => ", $b);

please try below code

$value_to_print = '';
$string = '"2148" => "50","2050" => "2","2403" => "1"';

$array = explode(',',$string);

foreach($array as $data){
       $indata = explode('=>',$data);           
       $value_to_print .= '<img src="images/item_values/'.trim($indata[0]).'.gif"> - '.trim($indata[1]).'';

}

It might be a better idea to save it in a better/more usable format, maybe using serialize:

The serialize function returns a string. You can then save that string in your database, at the same place you save your other string.

say this is your array:

$a = [2258=>"here",2259=>"then"];
$s = serialize($a);
// save the content of $s to your database

then, to get an array from the produced string:

// $s is the string from your database
$a = unserialize($s);

I think the below code will help you to decode the given string array correctly. Here you need to explore first by ',' and then followed by '=>'

$string = '"2148" => "50","2050" => "2","2403" => "1"';

$value_to_print = "";

 $items = explode(",",$string);
foreach($items as $item)
{
  $pair = explode("=>",str_replace('"','',$item));
   $value_to_print .= '<img src="images/item_values/'.$pair[0].'.gif"> - '.$pair[1].'';
}

echo $value_to_print;

Here str_replace function can be used to remove the quotes

I would just use eval instead. Basically make make it into a PHP expression and then use eval. Try this.

$string = '"2148" => "50","2050" => "2","2403" => "1"';
$string = 'return array(' . $string . ');';
$array = eval($string);

$value_to_print = '';

foreach($array as $id => $value){
    $value_to_print .= '<img src="images/item_values/'.$id.'.gif"> - '.$value.'';
}

echo $value_to_print;

Please try the Below code Snipet It will work.

<?php
    $string = '"2148" => "50","2050" => "2","2403" => "1"';
    $string = str_replace('"','',$string);

    $arrayList = explode(",",$string);
    $imageData = array();

    foreach($arrayList as $id=>$values){
        $arrayElemenets = explode(" => ",$values);
        $imageData[$arrayElemenets[0]] = $arrayElemenets[1];
    }

    $value_to_print = "";
    foreach($imageData as $id => $value){
        $value_to_print .= '<img src="images/item_values/'.$id.'.gif"> - '.$value.'';
    }

    echo $value_to_print;
?>

$string = '"2148" => "50","2050" => "2","2403" => "1"';   
$arr = array();

// split into key-val pairs
foreach(explode(',', $string) as $pair) {
    // we use a regular expression in case the input does not 
    // have spaces surrounding the "hash-rocket"
    // we also use str_replace to remove quotes
    $key_val = preg_split("/[\s*]=>[\s*]/", str_replace('"', "", $pair));
    // ensure pair is well formed
    if (count($key_val) === 2) {
        $arr[$key_val[0]] = $key_val[1];
    }
}

Output:

array(3) {
  [2148]=>
  string(2) "50"
  [2050]=>
  string(1) "2"
  [2403]=>
  string(1) "1"
}