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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 |
|---|---|
| 88 | |
| 89 | // The directory containing the original file may no longer exist when |
| 90 | // using a replication plugin. |
| 91 | wp_mkdir_p( dirname( $dst_file ) ); |
| 92 | |
| 93 | $dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), basename( $dst_file ) ); |
| 94 | |
| 95 | if ( 'image/png' == $image_type && imagepng( $dst, $dst_file ) ) |
| 96 | return $dst_file; |
| 97 | elseif ( imagejpeg( $dst, $dst_file, apply_filters( 'jpeg_quality', 90, 'wp_crop_image' ) ) ) |
| 98 | return $dst_file; |
| 99 | else |
| 100 | return false; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Generate post thumbnail attachment meta data. |
| 105 | * |
| 106 | * @since 2.1.0 |