138 lines
3.9 KiB
PHP
138 lines
3.9 KiB
PHP
<?php
|
|
|
|
class EXIF
|
|
{
|
|
public $aperture = 0;
|
|
public $credit = '';
|
|
public $camera = '';
|
|
public $caption = '';
|
|
public $created_timestamp = 0;
|
|
public $copyright = '';
|
|
public $focal_length = 0;
|
|
public $iso = 0;
|
|
public $shutter_speed = 0;
|
|
public $title = '';
|
|
|
|
private function __construct(array $meta)
|
|
{
|
|
foreach ($meta as $key => $value)
|
|
$this->$key = $value;
|
|
}
|
|
|
|
public static function fromFile($file, $as_array = false, $override_cache = false)
|
|
{
|
|
if (!file_exists($file))
|
|
return false;
|
|
|
|
$meta = [
|
|
'aperture' => 0,
|
|
'credit' => '',
|
|
'camera' => '',
|
|
'caption' => '',
|
|
'created_timestamp' => 0,
|
|
'copyright' => '',
|
|
'focal_length' => 0,
|
|
'iso' => 0,
|
|
'shutter_speed' => 0,
|
|
'title' => '',
|
|
];
|
|
|
|
if (!function_exists('exif_read_data'))
|
|
throw new Exception("The PHP module 'exif' appears to be disabled. Please enable it to use EXIF functions.");
|
|
|
|
list(, , $image_type) = getimagesize($file);
|
|
if (!in_array($image_type, [IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM]))
|
|
return new self($meta);
|
|
|
|
$exif = @exif_read_data($file);
|
|
|
|
if (!empty($exif['Title']))
|
|
$meta['title'] = trim($exif['Title']);
|
|
|
|
if (!empty($exif['ImageDescription']))
|
|
{
|
|
if (empty($meta['title']) && strlen($exif['ImageDescription']) < 80)
|
|
{
|
|
$meta['title'] = trim($exif['ImageDescription']);
|
|
if (!empty($exif['COMPUTED']['UserComment']) && trim($exif['COMPUTED']['UserComment']) != $meta['title'])
|
|
$meta['caption'] = trim($exif['COMPUTED']['UserComment']);
|
|
}
|
|
elseif (trim($exif['ImageDescription']) != $meta['title'])
|
|
$meta['caption'] = trim($exif['ImageDescription']);
|
|
}
|
|
elseif (!empty($exif['Comments']) && trim($exif['Comments']) != $meta['title'])
|
|
$meta['caption'] = trim($exif['Comments']);
|
|
|
|
if (!empty($exif['Artist']))
|
|
$meta['credit'] = trim($exif['Artist']);
|
|
elseif (!empty($exif['Author']))
|
|
$meta['credit'] = trim($exif['Author']);
|
|
|
|
if (!empty($exif['Copyright']))
|
|
$meta['copyright'] = trim($exif['Copyright']);
|
|
|
|
if (!empty($exif['ExposureTime']))
|
|
$meta['shutter_speed'] = (string) self::frac2dec($exif['ExposureTime']);
|
|
|
|
if (!empty($exif['FNumber']))
|
|
$meta['aperture'] = round(self::frac2dec($exif['FNumber']), 2);
|
|
|
|
if (!empty($exif['FocalLength']))
|
|
$meta['focal_length'] = (string) self::frac2dec($exif['FocalLength']);
|
|
|
|
if (!empty($exif['ISOSpeedRatings']))
|
|
{
|
|
$meta['iso'] = is_array($exif['ISOSpeedRatings']) ? reset($exif['ISOSpeedRatings']) : $exif['ISOSpeedRatings'];
|
|
$meta['iso'] = trim($meta['iso']);
|
|
}
|
|
|
|
if (!empty($exif['Model']))
|
|
{
|
|
if (!empty($exif['Make']) && strpos($exif['Model'], $exif['Make']) === false)
|
|
$meta['camera'] = trim($exif['Make']) . ' ' . trim($exif['Model']);
|
|
else
|
|
$meta['camera'] = trim($exif['Model']);
|
|
}
|
|
elseif (!empty($exif['Make']))
|
|
$meta['camera'] = trim($exif['Make']);
|
|
|
|
if (!empty($exif['DateTimeOriginal']))
|
|
$meta['created_timestamp'] = self::toUnixTime($exif['DateTimeOriginal']);
|
|
elseif (!empty($exif['DateTimeDigitized']))
|
|
$meta['created_timestamp'] = self::toUnixTime($exif['DateTimeDigitized']);
|
|
|
|
return new self($meta);
|
|
}
|
|
|
|
public function shutterSpeedFraction()
|
|
{
|
|
$speed = $this->shutter_speed;
|
|
if (empty($this->shutter_speed))
|
|
return '';
|
|
|
|
if (1 / $this->shutter_speed <= 1)
|
|
return $this->shutter_speed . ' seconds';
|
|
|
|
$speed = (float) 1 / $this->shutter_speed;
|
|
if (in_array($speed, [1.3, 1.5, 1.6, 2.5]))
|
|
return "1/" . number_format($speed, 1, '.', '') . ' second';
|
|
else
|
|
return "1/" . number_format($speed, 0, '.', '') . ' second';
|
|
}
|
|
|
|
// Convert a fraction string to a decimal.
|
|
private static function frac2dec($str)
|
|
{
|
|
@list($n, $d) = explode('/', $str);
|
|
return !empty($d) ? $n / $d : $str;
|
|
}
|
|
|
|
// Convert an EXIF formatted date to a UNIX timestamp.
|
|
private static function toUnixTime($str)
|
|
{
|
|
@list($date, $time) = explode(' ', trim($str));
|
|
@list($y, $m, $d) = explode(':', $date);
|
|
return strtotime("{$y}-{$m}-{$d} {$time}");
|
|
}
|
|
}
|