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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 |
|---|---|
| 117 | public function load() { |
| 118 | if ( $this->image instanceof Imagick ) |
| 119 | return true; |
| 120 | |
| 121 | if ( ! is_file( $this->file ) && ! preg_match( '|^https?://|', $this->file ) ) |
| 122 | return new WP_Error( 'error_loading_image', __('File doesn’t exist?'), $this->file ); |
| 123 | |
| 124 | /** This filter is documented in wp-includes/class-wp-image-editor-imagick.php */ |
| 125 | // Even though Imagick uses less PHP memory than GD, set higher limit for users that have low PHP.ini limits |
| 126 | @ini_set( 'memory_limit', apply_filters( 'image_memory_limit', WP_MAX_MEMORY_LIMIT ) ); |
| 127 | |
| 128 | try { |
| 129 | $this->image = new Imagick( $this->file ); |
| 130 | |
| 131 | if( ! $this->image->valid() ) |
| 132 | return new WP_Error( 'invalid_image', __('File is not an image.'), $this->file); |
| 133 | |
| 134 | // Select the first frame to handle animated images properly |
| 135 | if ( is_callable( array( $this->image, 'setIteratorIndex' ) ) ) |