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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 62 | imagecopyresampled( $dst, $src, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h ); |
| 63 | |
| 64 | imagedestroy( $src ); // Free up memory |
| 65 | |
| 66 | if ( ! $dst_file ) |
| 67 | $dst_file = str_replace( basename( $src_file ), 'cropped-' . basename( $src_file ), $src_file ); |
| 68 | |
| 69 | $dst_file = preg_replace( '/\\.[^\\.]+$/', '.jpg', $dst_file ); |
| 70 | |
| 71 | if ( imagejpeg( $dst, $dst_file, apply_filters( 'jpeg_quality', 90, 'wp_crop_image' ) ) ) |
| 72 | return $dst_file; |
| 73 | else |
| 74 | return false; |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Generate post image attachment meta data. |
| 79 | * |
| 80 | * @since 2.1.0 |