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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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135 |
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136 | // Keep in mind when using this filter and altering the cat_ID that the two queries above |
137 | // have already taken place with the OLD cat_ID |
138 | // Also note that you may have post2cat entries with the old cat_ID if this is an update |
139 |
|
140 | if ($update) { |
141 | do_action('edit_category', $cat_ID); |
142 | } else { |
143 | do_action('create_category', $cat_ID); |
144 | do_action('add_category', $cat_ID); |
145 | } |
146 |
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147 | $cat_ID = apply_filters('cat_id_filter', $cat_ID, $update); |
148 |
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149 | clean_category_cache($cat_ID); |
150 |
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151 | return $cat_ID; |
152 | } |
153 |
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