Get URL Variable From Array

Question

I am trying to get the URL variable ID from a list of objects in an array and display them.

Current Code:

$display = print_r($array);
echo $display;

Output:

Array ( [0] => https://example.com?ID=435 [1] => https://example.com?ID=53 [2] => https://example.com?ID=5 [3] => https://example.com?ID=25 )

I would like the display each URL variable ID from the array inside a <div> element:

<div>435</div>
<div>53</div>
<div>5</div>
<div>25</div>

I have tried to do this using the following code but no luck:

foreach($display as $display2) {
   echo '<div>'.$_GET['ID'].'</div>';
}

This will involve regex (regular expressions). The $_GET variable pulls from the current page's request and is not a function for stripping query data from a string. — Wes Foster
– Wes Foster, Commented Jul 29, 2016 at 20:56

Peter Bailey · Accepted Answer · 2016-08-01 16:21:41Z

2

The $_GET super global is for accessing query-string values from the current request, not for reading them out of an arbitrary url stored in a string.

But fret not, PHP's standard library has functions to help, namely parse_url() and parse_str()

foreach($display as $url) {
   $queryString = parse_url($url, PHP_URL_QUERY);
   parse_str($queryString, $parameters);
   echo '<div>'.$parameters['ID'].'</div>';
}

edited Aug 1, 2016 at 16:21

answered Jul 29, 2016 at 21:06

Peter Bailey

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Comments

George Sharvadze · Accepted Answer · 2016-07-29 21:02:57Z

1

Assuming that $array holds all the URLS, as shown in your example:

foreach($array as $v){
    $str = explode('=', $v);
    echo '<div>'.$str[1].'</div>';
}

answered Jul 29, 2016 at 21:02

George Sharvadze

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Comments

Tyler Roper · Accepted Answer · 2016-07-29 21:07:56Z

1

What you're looking for is probably something like this. You need to loop through each URL in the array and extract the ID from it. This can be done by splitting the URL at the = and grabbing the second portion.

foreach($display as $display2) {
   $stringArray = explode("=", $display2); //Break apart string at "="
   $id = $stringArray[1]; //Grab second part of split string (the ID)
   echo '<div>'.$id.'</div>';
}

edited Jul 29, 2016 at 21:07

answered Jul 29, 2016 at 21:02

Tyler Roper

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Comments

War10ck · Accepted Answer · 2016-07-29 21:15:33Z

0

$_GET is a super global that contains all of the query parameters for the page that was requested. It cannot be used on a list of url strings.

Instead, you can use a combination of substr() and strrpos():

$urls = array(
    "https://example.com?ID=435",
    "https://example.com?ID=53",
    "https://example.com?ID=5",
    "https://example.com?ID=25",
);

foreach($urls as $url) {
    if(strrpos($url, "?") !== FALSE) {
        echo "<div>" . substr($url, strrpos($url, "?") + 4) . "<br />";
    }
}

Feel free to copy and paste the above example into phpfiddle.org to verify that it works as expected.

EDIT:

Added if block around the echo to filter out urls that may not have an ID value.

edited Jul 29, 2016 at 21:15

answered Jul 29, 2016 at 21:05

War10ck

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2 Comments

The Codesee Over a year ago

I noticed the + 4 in your code. Is this how many objects in the array there are? I just posted an example; I cannot foresee how many objects there will be (it varies)

War10ck Over a year ago

No, it's the number of characters past the query string's question mark ? that thesubstr() operation should start from. i.e. Counting the ? the substr() function should move 4 characters ?=ID before beginning the substr() operation. It's an offset, since you know the query string parameter's name. However, if what was posted was an example, this would not work. It's a crude but effective way of doing what you want if the urls always have 1 parameter named ID. Admittedly, the other answers may be better suited if the urls are just examples.

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