php - Write file after extract data -

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i need piece of code. i'm working on customers list of club, can extract email address , print them on screen, can't write them txt. here's code:

<?php if ( $_post ){  function extract_emails($str) {     $regexp = '/([a-z0-9_\.\-])+\@(([a-z0-9\-])+\.)+([a-z0-9]{2,4})+/i';     preg_match_all($regexp, $str, $m);     return isset($m[0]) ? $m[0] : array(); }  $xurl = $_post['testo'];// there input field $doc = new domdocument(); @$doc->loadhtmlfile($xurl); $xpath = new domxpath($doc); $wpage = $xpath->query('//body[@*]'); print_r(extract_emails($wpage->item(0)->nodevalue)); $scrivi=fopen("emails.txt","a"); fwrite($scrivi,need here."\n"); fclose($scrivi);  } ?>

everytime , try output found in file "array".

[solved] @jdo, i've solved way:

$mail = (extract_emails($wpage->item(0)->nodevalue)); $result = var_export($mail, true); echo $result ; $scrivi=fopen("emails.txt","a"); fwrite($scrivi,$result."\n"); fclose($scrivi);

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