PHP正则表达式从文件名中提取电话号码

Question

I'm trying to add filenames with phone numbers in array. My test files are:

dsfdsf543-6786sdfsdfd.jpg
543-6786sdfsdfd.jpg
435-3454
dsfdsf543-6786.jpg
123-4567
543-6786.jpg
345-3454

My goal is different phone numbers will have separate line of elements in array. Each element in array line will have same phone number. For example:

543-6786 dsfdsf543-6786sdfsdfd.jpg 543-6786sdfsdfd.jpg dsfdsf543-6786.jpg 543-6786.jpg
435-3454
123-4567
345-3454

My code:

$directory = $_SERVER['DOCUMENT_ROOT'];
$handler = opendir($directory);
while ($file = readdir($handler)) {


    if ($file != "." && $file != "..") {
      $regex = "/[\D]*[0-9]{3}-[0-9]{4}[\D]*/";
               preg_match_all($regex, $file, $results);

   }
}
print_r ($results);

Result is

Array ( [0] => Array ( [0] => 345-3454 ) )

why only one filename in the array? Where is my mistake? Thank you in advance!

Answer 1

You're feeding the filenames to preg_match_all one at a time, and each time $result gets overwritten. The thing is to push $results[0] onto an array each time, and then dump that array.

$final_results = [];
while ($file = readdir($handler)) {
    if ($file != "." && $file != "..") {
        $regex = "/[\D]*[0-9]{3}-[0-9]{4}[\D]*/";
        if (preg_match_all($regex, $file, $results) > 0)
            $final_results[] = $results[0] ;
    }
}
print_r ($final_results);

Updated per comment: this version creates a key=>value array where the phone number is the key and the value is all the filenames that contain that number.

$final_results = [];
while ($file = readdir($handler)) {
    if ($file != "." && $file != "..") {
        $regex = "/[\D]*[0-9]{3}-[0-9]{4}[\D]*/";
        if (preg_match_all($regex, $file, $results) > 0) {
            if empty ($final_results[$results[0]]) {
                $final_results[$results[0]] = $file ;
            } else {
                $final_results[results[0]] .= " ".$file ;
            }
        }
    }
}
print_r ($final_results);

Once you've got this array, it's trivially easy to flatten it to a one-dimensional array like you want.