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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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111 | /** |
112 | * Filter whether to return the package. |
113 | * |
114 | * @since 3.7.0 |
115 | * |
116 | * @param bool $reply Whether to bail without returning the package. Default is false. |
117 | * @param string $package The package file name. |
118 | * @param object $this The WP_Upgrader instance. |
119 | */ |
120 | $reply = apply_filters( 'upgrader_pre_download', false, $package, $this ); |
121 | if ( false !== $reply ) |
122 | return $reply; |
123 |
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124 | if ( ! preg_match('!^(http|https|ftp)://!i', $package) && file_exists($package) ) //Local file or remote? |
125 | return $package; //must be a local file.. |
126 |
|
127 | if ( empty($package) ) |
128 | return new WP_Error('no_package', $this->strings['no_package']); |
129 |
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