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