Extract a particular span

Question

I'm trying to extract a value from a span from a url of a site but I can not isolate this particular value ....

here is the span in question

<span data-currency-market="" data-usd="63968175026.0">

I want the data-usd value only

 $html1 = file_get_contents( 'https://url.com' );
 $dom1 = new DOMDocument();
 @$dom1->loadHTML( $html1 );
 foreach ($dom1->getElementsByTagName('span') as $tag) {
    echo $tag->nodeValue . '<br/>';
 }

Answer 1

You can use preg_match_all like this

<?php

    // Loading data for demo
    $html1 = '[...]
    <span data-currency-market="" data-usd="63968175026.0"></span>
    <span data-currency-market="" data-usd="63968175026.0"></span>
    <span data-currency-market="" data-usd="63968175026.0"></span>';

    // Your data source
    //$html1 = file_get_contents( $string );

    preg_match_all('/usd="(.*)"/', $html1, $output_array);

    // Showing array
    echo "<pre>";
    print_r($output_array);
    echo "</pre>";
?>

Will output this:

If all you need are the numbers juste use

print_r($output_array[1]);

So at the end, all you need is 2 lines of code

$html1 = file_get_contents( $string );
preg_match_all('/usd="(.*)"/', $html1, $output_array);

You can use

foreach($output_array[1] as $key=>$value){
    echo $value;
}

to retreive the values

If you expect only one match in that page, you can use preg_match the same way like this instead of preg_match_all

<?php
    $html1 = '[...]
    <span data-currency-market="" data-usd="63968175026.0"></span>
    <span data-currency-market="" data-cad="73175026.0"></span>
    <span data-currency-market="" data-eur="83968176.0"></span>';
    //$html1 = file_get_contents( $string );
    preg_match('/usd="(.*)"/', $html1, $output_array);

    echo $output_array[1];
?>

Will output: 63968175026.0