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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.
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90 | * @since 2.5.0 |
91 | * |
92 | * @param array $max_image_size An array with the width as the first element, |
93 | * and the height as the second element. |
94 | * @param string|array $size Size of what the result image should be. |
95 | * @param string $context The context the image is being resized for. |
96 | * Possible values are 'display' (like in a theme) |
97 | * or 'edit' (like inserting into an editor). |
98 | */ |
99 | list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size, $context ); |
100 |
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101 | return wp_constrain_dimensions( $width, $height, $max_width, $max_height ); |
102 | } |
103 |
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104 | /** |
105 | * Retrieve width and height attributes using given width and height values. |
106 | * |
107 | * Both attributes are required in the sense that both parameters must have a |
108 | * value, but are optional in that if you set them to false or null, then they |