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wp_read_image_metadata › WordPress Function

Since2.5.0
Deprecatedn/a
wp_read_image_metadata ( $file )
Parameters:
  • (string) $file
    Required: Yes
Returns:
  • (array|false) Image metadata array on success, false on failure.
Defined at:
Codex:

Gets extended image metadata, exif or iptc as available.

Retrieves the EXIF metadata aperture, credit, camera, caption, copyright, iso created_timestamp, focal_length, shutter_speed, and title. The IPTC metadata that is retrieved is APP13, credit, byline, created date and time, caption, copyright, and title. Also includes FNumber, Model, DateTimeDigitized, FocalLength, ISOSpeedRatings, and ExposureTime.


Source

function wp_read_image_metadata( $file ) {
	if ( ! file_exists( $file ) ) {
		return false;
	}

	list( , , $image_type ) = wp_getimagesize( $file );

	/*
	 * EXIF contains a bunch of data we'll probably never need formatted in ways
	 * that are difficult to use. We'll normalize it and just extract the fields
	 * that are likely to be useful. Fractions and numbers are converted to
	 * floats, dates to unix timestamps, and everything else to strings.
	 */
	$meta = array(
		'aperture'          => 0,
		'credit'            => '',
		'camera'            => '',
		'caption'           => '',
		'created_timestamp' => 0,
		'copyright'         => '',
		'focal_length'      => 0,
		'iso'               => 0,
		'shutter_speed'     => 0,
		'title'             => '',
		'orientation'       => 0,
		'keywords'          => array(),
	);

	$iptc = array();
	$info = array();
	/*
	 * Read IPTC first, since it might contain data not available in exif such
	 * as caption, description etc.
	 */
	if ( is_callable( 'iptcparse' ) ) {
		wp_getimagesize( $file, $info );

		if ( ! empty( $info['APP13'] ) ) {
			// Don't silence errors when in debug mode, unless running unit tests.
			if ( defined( 'WP_DEBUG' ) && WP_DEBUG
				&& ! defined( 'WP_RUN_CORE_TESTS' )
			) {
				$iptc = iptcparse( $info['APP13'] );
			} else {
				// Silencing notice and warning is intentional. See https://core.trac.wordpress.org/ticket/42480
				$iptc = @iptcparse( $info['APP13'] );
			}

			if ( ! is_array( $iptc ) ) {
				$iptc = array();
			}

			// Headline, "A brief synopsis of the caption".
			if ( ! empty( $iptc['2#105'][0] ) ) {
				$meta['title'] = trim( $iptc['2#105'][0] );
				/*
				* Title, "Many use the Title field to store the filename of the image,
				* though the field may be used in many ways".
				*/
			} elseif ( ! empty( $iptc['2#005'][0] ) ) {
				$meta['title'] = trim( $iptc['2#005'][0] );
			}

			if ( ! empty( $iptc['2#120'][0] ) ) { // Description / legacy caption.
				$caption = trim( $iptc['2#120'][0] );

				mbstring_binary_safe_encoding();
				$caption_length = strlen( $caption );
				reset_mbstring_encoding();

				if ( empty( $meta['title'] ) && $caption_length < 80 ) {
					// Assume the title is stored in 2:120 if it's short.
					$meta['title'] = $caption;
				}

				$meta['caption'] = $caption;
			}

			if ( ! empty( $iptc['2#110'][0] ) ) { // Credit.
				$meta['credit'] = trim( $iptc['2#110'][0] );
			} elseif ( ! empty( $iptc['2#080'][0] ) ) { // Creator / legacy byline.
				$meta['credit'] = trim( $iptc['2#080'][0] );
			}

			if ( ! empty( $iptc['2#055'][0] ) && ! empty( $iptc['2#060'][0] ) ) { // Created date and time.
				$meta['created_timestamp'] = strtotime( $iptc['2#055'][0] . ' ' . $iptc['2#060'][0] );
			}

			if ( ! empty( $iptc['2#116'][0] ) ) { // Copyright.
				$meta['copyright'] = trim( $iptc['2#116'][0] );
			}

			if ( ! empty( $iptc['2#025'][0] ) ) { // Keywords array.
				$meta['keywords'] = array_values( $iptc['2#025'] );
			}
		}
	}

	$exif = array();

	/**
	 * Filters the image types to check for exif data.
	 *
	 * @since 2.5.0
	 *
	 * @param int[] $image_types Array of image types to check for exif data. Each value
	 *                           is usually one of the `IMAGETYPE_*` constants.
	 */
	$exif_image_types = apply_filters( 'wp_read_image_metadata_types', array( IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM ) );

	if ( is_callable( 'exif_read_data' ) && in_array( $image_type, $exif_image_types, true ) ) {
		// Don't silence errors when in debug mode, unless running unit tests.
		if ( defined( 'WP_DEBUG' ) && WP_DEBUG
			&& ! defined( 'WP_RUN_CORE_TESTS' )
		) {
			$exif = exif_read_data( $file );
		} else {
			// Silencing notice and warning is intentional. See https://core.trac.wordpress.org/ticket/42480
			$exif = @exif_read_data( $file );
		}

		if ( ! is_array( $exif ) ) {
			$exif = array();
		}

		$exif_description = '';
		$exif_usercomment = '';
		if ( ! empty( $exif['ImageDescription'] ) ) {
			$exif_description = trim( $exif['ImageDescription'] );
		}

		if ( ! empty( $exif['COMPUTED']['UserComment'] ) ) {
			$exif_usercomment = trim( $exif['COMPUTED']['UserComment'] );
		}

		if ( $exif_description ) {
			mbstring_binary_safe_encoding();
			$description_length = strlen( $exif_description );
			reset_mbstring_encoding();
			if ( empty( $meta['title'] ) && $description_length < 80 ) {
				// Assume the title is stored in ImageDescription.
				$meta['title'] = $exif_description;
			}

			// If both user comments and description are present.
			if ( empty( $meta['caption'] ) && $exif_description && $exif_usercomment ) {
				if ( ! empty( $meta['title'] ) && $exif_description === $meta['title'] ) {
					$caption = $exif_usercomment;
				} else {
					if ( $exif_description === $exif_usercomment ) {
						$caption = $exif_description;
					} else {
						$caption = trim( $exif_description . ' ' . $exif_usercomment );
					}
				}
				$meta['caption'] = $caption;
			}

			if ( empty( $meta['caption'] ) && $exif_usercomment ) {
				$meta['caption'] = $exif_usercomment;
			}

			if ( empty( $meta['caption'] ) ) {
				$meta['caption'] = $exif_description;
			}
		} elseif ( empty( $meta['caption'] ) && $exif_usercomment ) {
			$meta['caption']    = $exif_usercomment;
			$description_length = strlen( $exif_usercomment );
			if ( empty( $meta['title'] ) && $description_length < 80 ) {
				$meta['title'] = trim( $exif_usercomment );
			}
		} elseif ( empty( $meta['caption'] ) && ! empty( $exif['Comments'] ) ) {
			$meta['caption'] = trim( $exif['Comments'] );
		}

		if ( empty( $meta['credit'] ) ) {
			if ( ! empty( $exif['Artist'] ) ) {
				$meta['credit'] = trim( $exif['Artist'] );
			} elseif ( ! empty( $exif['Author'] ) ) {
				$meta['credit'] = trim( $exif['Author'] );
			}
		}

		if ( empty( $meta['copyright'] ) && ! empty( $exif['Copyright'] ) ) {
			$meta['copyright'] = trim( $exif['Copyright'] );
		}
		if ( ! empty( $exif['FNumber'] ) && is_scalar( $exif['FNumber'] ) ) {
			$meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
		}
		if ( ! empty( $exif['Model'] ) ) {
			$meta['camera'] = trim( $exif['Model'] );
		}
		if ( empty( $meta['created_timestamp'] ) && ! empty( $exif['DateTimeDigitized'] ) ) {
			$meta['created_timestamp'] = wp_exif_date2ts( $exif['DateTimeDigitized'] );
		}
		if ( ! empty( $exif['FocalLength'] ) ) {
			$meta['focal_length'] = (string) $exif['FocalLength'];
			if ( is_scalar( $exif['FocalLength'] ) ) {
				$meta['focal_length'] = (string) wp_exif_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['ExposureTime'] ) ) {
			$meta['shutter_speed'] = (string) $exif['ExposureTime'];
			if ( is_scalar( $exif['ExposureTime'] ) ) {
				$meta['shutter_speed'] = (string) wp_exif_frac2dec( $exif['ExposureTime'] );
			}
		}
		if ( ! empty( $exif['Orientation'] ) ) {
			$meta['orientation'] = $exif['Orientation'];
		}
	}

	foreach ( array( 'title', 'caption', 'credit', 'copyright', 'camera', 'iso' ) as $key ) {
		if ( $meta[ $key ] && ! seems_utf8( $meta[ $key ] ) ) {
			$meta[ $key ] = utf8_encode( $meta[ $key ] );
		}
	}

	foreach ( $meta['keywords'] as $key => $keyword ) {
		if ( ! seems_utf8( $keyword ) ) {
			$meta['keywords'][ $key ] = utf8_encode( $keyword );
		}
	}

	$meta = wp_kses_post_deep( $meta );

	/**
	 * Filters the array of meta data read from an image's exif data.
	 *
	 * @since 2.5.0
	 * @since 4.4.0 The `$iptc` parameter was added.
	 * @since 5.0.0 The `$exif` parameter was added.
	 *
	 * @param array  $meta       Image meta data.
	 * @param string $file       Path to image file.
	 * @param int    $image_type Type of image, one of the `IMAGETYPE_XXX` constants.
	 * @param array  $iptc       IPTC data.
	 * @param array  $exif       EXIF data.
	 */
	return apply_filters( 'wp_read_image_metadata', $meta, $file, $image_type, $iptc, $exif );
}