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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 |
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255 |
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256 | function wp_save_image_file($filename, $image, $mime_type, $post_id) { |
257 | $image = apply_filters('image_save_pre', $image, $post_id); |
258 | $saved = apply_filters('wp_save_image_file', null, $filename, $image, $mime_type, $post_id); |
259 | if ( null !== $saved ) |
260 | return $saved; |
261 |
|
262 | switch ( $mime_type ) { |
263 | case 'image/jpeg': |
264 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |
265 | case 'image/png': |
266 | return imagepng($image, $filename); |
267 | case 'image/gif': |
268 | return imagegif($image, $filename); |
269 | default: |
270 | return false; |
271 | } |
272 | } |
273 |
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