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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 |
|---|---|
| 177 | * Filters Twenty Twenty-Ones's array of icons. |
| 178 | * |
| 179 | * The dynamic portion of the hook name, `$group`, refers to |
| 180 | * the name of the group of icons, either "ui" or "social". |
| 181 | * |
| 182 | * @since Twenty Twenty-One 1.0 |
| 183 | * |
| 184 | * @param array $arr Array of icons. |
| 185 | */ |
| 186 | $arr = apply_filters( "twenty_twenty_one_svg_icons_{$group}", $arr ); |
| 187 | |
| 188 | $svg = ''; |
| 189 | if ( array_key_exists( $icon, $arr ) ) { |
| 190 | $repl = sprintf( '<svg class="svg-icon" width="%d" height="%d" aria-hidden="true" role="img" focusable="false" ', $size, $size ); |
| 191 | |
| 192 | $svg = preg_replace( '/^<svg /', $repl, trim( $arr[ $icon ] ) ); // Add extra attributes to SVG code. |
| 193 | } |
| 194 | |
| 195 | // @phpstan-ignore-next-line. |