PHP inbuilt function mime_content_type() has been deprecated and PECL extension Fileinfo provides the same functionality to detect MIME content type of a file, Lets create a simple PHP function to detect MIME content type of a file. Click here to know about MIME type of a file.

PHP Function

<?php
if(!function_exists('mime_content_type')) {
     function mime_content_type($filename) {
     $mime_types = array(
                   'txt' => 'Text File',
                  'htm' => 'HTML File',
                  'html' => 'HTML File',
                  'php' => 'PHP File',
                  'css' => 'CSS File',
                  'js' => 'JavaScript File',
                  'json' => 'JSON File',
                  'xml' => 'XML File ',
                  'swf' => 'Shockwave Flash File',
                  'flv' => 'FLV Video',
                  'htaccess' => 'HTACCESS File',
                  'htpasswd' => 'HTPASSWORD File',
                  'ini' => 'INI File',
// images
                  'png' => 'PNG Image',
                  'jpe' => 'JPEG Image',
                  'jpeg' => 'JPEG Image',
                  'jpg' => 'JPEG Image',
                  'gif' => 'GIF Image',
                  'bmp' => 'BMP Image',
                  'psd' => 'PHOTOSHOP Files',
                  'PDF' => 'PDF Files',
                  'ico' => 'ICON File',
                  'tiff' => 'TIFF Image',
                  'tif' => 'TIFF Image',
                  'svg' => 'SVG File',
                  'svgz' => 'SVG File',
// archives
                  'zip' => 'ZIP File',
                  'rar' => 'RAR File',
                  'exe' => 'EXE Files',
                  'msi' => 'MSI Files',
                  'cab' => 'CAB Files',
// audio/video
                  'mp3' => 'audio/mpeg',
                  'qt' => 'video/quicktime',
                  'mov' => 'video/quicktime',
// adobe
                  'pdf' => 'application/pdf',
                  'psd' => 'image/vnd.adobe.photoshop',
                  'ai' => 'application/postscript',
                  'eps' => 'application/postscript',
                  'ps' => 'application/postscript',
// ms office
                  'doc' => 'MS WORD File',
                  'docx' => 'MSWORD File',
                  'rtf' => 'RTF File',
                  'xls' => 'MS EXCEL File',
                  'ppt' => 'MS POWER POINT File',
                  'xlsx' => 'MS EXCEL File',
                  'pptx' => 'MS POWER POINT File',
// open office
                  'odt' => 'application/vnd.oasis.opendocument.text',
                  'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
);

$ext = strtolower(array_pop(explode('.',$filename)));

if (function_exists("finfo_file")) {
       $finfo = finfo_open(FILEINFO_MIME, "/usr/share/misc/magic");
if ($finfo) {
       return finfo_file($finfo, $filename);
}else{
       if(array_key_exists($ext, $mime_types)){
       return $mime_types[$ext]; 
}
}
@finfo_close($finfo);
}elseif (array_key_exists($ext, $mime_types)) {
      return $mime_types[$ext];
}
else {
      return 'application/octet-stream';
}
}
}
?>

Call in Action

<?php
  $fileName = "myFile.php";
  echo mime_content_type($fileName);
?>