如何通过文件名的关键字匹配对文件数组进行排序

Question

I have this sort function which scans a directory and lists all jpg files, how could I make it to sort only jpg files whose file-name match a specified keyword, for example to find and sort all jpg files whose name includes the keyword "toys".

   $a_img[] = array(); // return values
$keyword = "toys"; // your keyword
$allowed_types = array('jpg'); // list of filetypes you want to show  
 $dimg = opendir($imgdir);  
 while($imgfile = readdir($dimg)) {
     // check to see if filename contains keyword
    if(false!==strpos($keyword, $imgfile)){
       //check file extension
        $extension = strtolower(substr($imgfile, strrpos($imgfile, ".")+1));
        if (in_array($extension, $allowed_types)) {
        // add file to your array
        $a_img[] = $imgfile;
        }
    }   
}
// sort alphabetically by filename
sort($a_img);


   $totimg = count($a_img); // total image number  
   for($x=0; $x < $totimg; $x++)  
       { 

    $size = getimagesize($imgdir.'/'.$a_img[$x]);  
   // do whatever  

   echo $a_img[$x];  

  }

Answer 1

You would want to check the filename for occurrences of your keyword using strpos() - http://php.net/manual/en/function.strrpos.php - and only add those files to your array. Assuming you want to sort alphabetically by filename, you sort this array using the sort() function - http://php.net/manual/en/function.sort.php

When using strpos() make sure to test for !==false otherwise your keyword at the beginning of the filename (for example "toys_picture.jpg") will return 0, which is falsey but not false.

You can also use strrpos() - http://www.php.net/manual/en/function.strrpos.php - to find the last occurrence of a . in your filename and use that for substr() should you want to support 3 and 4 character file extensions (both "jpg" and "jpeg" for example).

$imgdir = "idximages"; // directory
$keyword = "toys"; // your keyword
$allowed_types = array('jpg'); // list of filetypes you want to show  
$a_img = array(); // return values
$dimg = opendir($imgdir);  
while($imgfile = readdir($dimg)) {
    // check to see if filename contains keyword
    if(false!==strpos($imgfile, $keyword)){
        //check file extension
        $extension = strtolower(substr($imgfile, strrpos($imgfile, ".")+1));
        if (in_array($extension, $allowed_types)) {
            // add file to your array
            $a_img[] = $imgfile;
        }
    }   
}
// sort alphabetically by filename
sort($a_img);

// iterate through filenames
foreach ($a_img as $file){
    $imagesize = getimagesize($imgdir.'/'.$file);
    print_r($imagesize);
    list($width, $height, $type, $attr) = $imagesize;
}