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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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91 | /** |
92 | * Filter the memory limit allocated for image manipulation. |
93 | * |
94 | * @since 3.5.0 |
95 | * |
96 | * @param int|string $limit Maximum memory limit to allocate for images. Default WP_MAX_MEMORY_LIMIT. |
97 | * Accepts an integer (bytes), or a shorthand string notation, such as '256M'. |
98 | */ |
99 | // Set artificially high because GD uses uncompressed images in memory |
100 | @ini_set( 'memory_limit', apply_filters( 'image_memory_limit', WP_MAX_MEMORY_LIMIT ) ); |
101 |
|
102 | $this->image = @imagecreatefromstring( file_get_contents( $this->file ) ); |
103 |
|
104 | if ( ! is_resource( $this->image ) ) |
105 | return new WP_Error( 'invalid_image', __('File is not an image.'), $this->file ); |
106 |
|
107 | $size = @getimagesize( $this->file ); |
108 | if ( ! $size ) |
109 | return new WP_Error( 'invalid_image', __('Could not read image size.'), $this->file ); |