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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 |
---|---|
1968 | } |
1969 | } else { |
1970 | $constraint = ''; |
1971 | } |
1972 |
|
1973 | $post_title = esc_attr($post->post_title); |
1974 |
|
1975 | $icon = "<img src='$src' title='$post_title' alt='$post_title' $constraint/>"; |
1976 |
|
1977 | return apply_filters( 'attachment_icon', $icon, $post->ID ); |
1978 | } |
1979 |
|
1980 | /** |
1981 | * Retrieve HTML content of image element. |
1982 | * |
1983 | * @since 2.0.0 |
1984 | * @deprecated 2.5.0 Use wp_get_attachment_image() |
1985 | * @see wp_get_attachment_image() |
1986 | * |