Parameters
$filename string required Path to a WebP file.
Source
function wp_get_webp_info( $filename ) { $width = false; $height = false; $type = false; if ( 'image/webp' !== wp_get_image_mime( $filename ) ) { return compact( 'width', 'height', 'type' ); } $magic = file_get_contents( $filename, false, null, 0, 40 ); if ( false === $magic ) { return compact( 'width', 'height', 'type' ); } // Make sure we got enough bytes. if ( strlen( $magic ) < 40 ) { return compact( 'width', 'height', 'type' ); } /* * The headers are a little different for each of the three formats. * Header values based on WebP docs, see https://developers.google.com/speed/webp/docs/riff_container. */ switch ( substr( $magic, 12, 4 ) ) { // Lossy WebP. case 'VP8 ': $parts = unpack( 'v2', substr( $magic, 26, 4 ) ); $width = (int) ( $parts[1] & 0x3FFF ); $height = (int) ( $parts[2] & 0x3FFF ); $type = 'lossy'; break; // Lossless WebP. case 'VP8L': $parts = unpack( 'C4', substr( $magic, 21, 4 ) ); $width = (int) ( $parts[1] | ( ( $parts[2] & 0x3F ) << 8 ) ) + 1; $height = (int) ( ( ( $parts[2] & 0xC0 ) >> 6 ) | ( $parts[3] << 2 ) | ( ( $parts[4] & 0x03 ) << 10 ) ) + 1; $type = 'lossless'; break; // Animated/alpha WebP. case 'VP8X': // Pad 24-bit int. $width = unpack( 'V', substr( $magic, 24, 3 ) . "\x00" ); $width = (int) ( $width[1] & 0xFFFFFF ) + 1; // Pad 24-bit int. $height = unpack( 'V', substr( $magic, 27, 3 ) . "\x00" ); $height = (int) ( $height[1] & 0xFFFFFF ) + 1; $type = 'animated-alpha'; break; } return compact( 'width', 'height', 'type' ); } Changelog
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