?<h3>D¨ızenle: category.php</h3>
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/**
 * Taxonomy API: Core category-specific functionality
 *
 * @package WordPress
 * @subpackage Taxonomy
 */

/**
 * Retrieves a list of category objects.
 *
 * If you set the &#039;taxonomy&#039; argument to &#039;link_category&#039;, the link categories
 * will be returned instead.
 *
 * @since 2.1.0
 *
 * @see get_terms() Type of arguments that can be changed.
 *
 * @param string|array $args {
 *     Optional. Arguments to retrieve categories. See get_terms() for additional options.
 *
 *     @type string $taxonomy Taxonomy to retrieve terms for. Default &#039;category&#039;.
 * }
 * @return array List of category objects.
 */
function get_categories( $args = &#039;&#039; ) {
	$defaults = array( &#039;taxonomy&#039; =&gt; &#039;category&#039; );
	$args     = wp_parse_args( $args, $defaults );

	/**
	 * Filters the taxonomy used to retrieve terms when calling get_categories().
	 *
	 * @since 2.7.0
	 *
	 * @param string $taxonomy Taxonomy to retrieve terms from.
	 * @param array  $args     An array of arguments. See get_terms().
	 */
	$args[&#039;taxonomy&#039;] = apply_filters( &#039;get_categories_taxonomy&#039;, $args[&#039;taxonomy&#039;], $args );

	// Back compat.
	if ( isset( $args[&#039;type&#039;] ) &amp;&amp; &#039;link&#039; === $args[&#039;type&#039;] ) {
		_deprecated_argument(
			__FUNCTION__,
			&#039;3.0.0&#039;,
			sprintf(
				/* translators: 1: &quot;type =&gt; link&quot;, 2: &quot;taxonomy =&gt; link_category&quot; */
				__( &#039;%1$s is deprecated. Use %2$s instead.&#039; ),
				&#039;&lt;code&gt;type =&gt; link&lt;/code&gt;&#039;,
				&#039;&lt;code&gt;taxonomy =&gt; link_category&lt;/code&gt;&#039;
			)
		);
		$args[&#039;taxonomy&#039;] = &#039;link_category&#039;;
	}

	$categories = get_terms( $args );

	if ( is_wp_error( $categories ) ) {
		$categories = array();
	} else {
		$categories = (array) $categories;
		foreach ( array_keys( $categories ) as $k ) {
			_make_cat_compat( $categories[ $k ] );
		}
	}

	return $categories;
}

/**
 * Retrieves category data given a category ID or category object.
 *
 * If you pass the $category parameter an object, which is assumed to be the
 * category row object retrieved the database. It will cache the category data.
 *
 * If you pass $category an integer of the category ID, then that category will
 * be retrieved from the database, if it isn&#039;t already cached, and pass it back.
 *
 * If you look at get_term(), then both types will be passed through several
 * filters and finally sanitized based on the $filter parameter value.
 *
 * @since 1.5.1
 *
 * @param int|object $category Category ID or category row object.
 * @param string     $output   Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
 *                             correspond to a WP_Term object, an associative array, or a numeric array,
 *                             respectively. Default OBJECT.
 * @param string     $filter   Optional. How to sanitize category fields. Default &#039;raw&#039;.
 * @return WP_Term|array|WP_Error|null Category data in type defined by $output parameter.
 *                                     Returns a WP_Term object with backwards compatible property aliases filled in.
 *                                     WP_Error if $category is empty, null if it does not exist.
 */
function get_category( $category, $output = OBJECT, $filter = &#039;raw&#039; ) {
	$category = get_term( $category, &#039;category&#039;, $output, $filter );

	if ( is_wp_error( $category ) ) {
		return $category;
	}

	_make_cat_compat( $category );

	return $category;
}

/**
 * Retrieves a category based on URL containing the category slug.
 *
 * Breaks the $category_path parameter up to get the category slug.
 *
 * Tries to find the child path and will return it. If it doesn&#039;t find a
 * match, then it will return the first category matching slug, if $full_match,
 * is set to false. If it does not, then it will return null.
 *
 * It is also possible that it will return a WP_Error object on failure. Check
 * for it when using this function.
 *
 * @since 2.1.0
 *
 * @param string $category_path URL containing category slugs.
 * @param bool   $full_match    Optional. Whether full path should be matched.
 * @param string $output        Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
 *                              correspond to a WP_Term object, an associative array, or a numeric array,
 *                              respectively. Default OBJECT.
 * @return WP_Term|array|WP_Error|null Type is based on $output value.
 */
function get_category_by_path( $category_path, $full_match = true, $output = OBJECT ) {
	$category_path  = rawurlencode( urldecode( $category_path ) );
	$category_path  = str_replace( &#039;%2F&#039;, &#039;/&#039;, $category_path );
	$category_path  = str_replace( &#039;%20&#039;, &#039; &#039;, $category_path );
	$category_paths = &#039;/&#039; . trim( $category_path, &#039;/&#039; );
	$leaf_path      = sanitize_title( basename( $category_paths ) );
	$category_paths = explode( &#039;/&#039;, $category_paths );
	$full_path      = &#039;&#039;;

	foreach ( (array) $category_paths as $pathdir ) {
		$full_path .= ( &#039;&#039; !== $pathdir ? &#039;/&#039; : &#039;&#039; ) . sanitize_title( $pathdir );
	}

	$categories = get_terms(
		array(
			&#039;taxonomy&#039; =&gt; &#039;category&#039;,
			&#039;get&#039;      =&gt; &#039;all&#039;,
			&#039;slug&#039;     =&gt; $leaf_path,
		)
	);

	if ( empty( $categories ) ) {
		return;
	}

	foreach ( $categories as $category ) {
		$path        = &#039;/&#039; . $leaf_path;
		$curcategory = $category;

		while ( ( 0 !== $curcategory-&gt;parent ) &amp;&amp; ( $curcategory-&gt;parent !== $curcategory-&gt;term_id ) ) {
			$curcategory = get_term( $curcategory-&gt;parent, &#039;category&#039; );

			if ( is_wp_error( $curcategory ) ) {
				return $curcategory;
			}

			$path = &#039;/&#039; . $curcategory-&gt;slug . $path;
		}

		if ( $path === $full_path ) {
			$category = get_term( $category-&gt;term_id, &#039;category&#039;, $output );
			_make_cat_compat( $category );

			return $category;
		}
	}

	// If full matching is not required, return the first cat that matches the leaf.
	if ( ! $full_match ) {
		$category = get_term( reset( $categories )-&gt;term_id, &#039;category&#039;, $output );
		_make_cat_compat( $category );

		return $category;
	}
}

/**
 * Retrieves a category object by category slug.
 *
 * @since 2.3.0
 *
 * @param string $slug The category slug.
 * @return object|false Category data object on success, false if not found.
 */
function get_category_by_slug( $slug ) {
	$category = get_term_by( &#039;slug&#039;, $slug, &#039;category&#039; );

	if ( $category ) {
		_make_cat_compat( $category );
	}

	return $category;
}

/**
 * Retrieves the ID of a category from its name.
 *
 * @since 1.0.0
 *
 * @param string $cat_name Category name.
 * @return int Category ID on success, 0 if the category doesn&#039;t exist.
 */
function get_cat_ID( $cat_name ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
	$cat = get_term_by( &#039;name&#039;, $cat_name, &#039;category&#039; );

	if ( $cat ) {
		return $cat-&gt;term_id;
	}

	return 0;
}

/**
 * Retrieves the name of a category from its ID.
 *
 * @since 1.0.0
 *
 * @param int $cat_id Category ID.
 * @return string Category name, or an empty string if the category doesn&#039;t exist.
 */
function get_cat_name( $cat_id ) {
	$cat_id   = (int) $cat_id;
	$category = get_term( $cat_id, &#039;category&#039; );

	if ( ! $category || is_wp_error( $category ) ) {
		return &#039;&#039;;
	}

	return $category-&gt;name;
}

/**
 * Checks if a category is an ancestor of another category.
 *
 * You can use either an ID or the category object for both parameters.
 * If you use an integer, the category will be retrieved.
 *
 * @since 2.1.0
 *
 * @param int|object $cat1 ID or object to check if this is the parent category.
 * @param int|object $cat2 The child category.
 * @return bool Whether $cat2 is child of $cat1.
 */
function cat_is_ancestor_of( $cat1, $cat2 ) {
	return term_is_ancestor_of( $cat1, $cat2, &#039;category&#039; );
}

/**
 * Sanitizes category data based on context.
 *
 * @since 2.3.0
 *
 * @param object|array $category Category data.
 * @param string       $context  Optional. Default &#039;display&#039;.
 * @return object|array Same type as $category with sanitized data for safe use.
 */
function sanitize_category( $category, $context = &#039;display&#039; ) {
	return sanitize_term( $category, &#039;category&#039;, $context );
}

/**
 * Sanitizes data in single category key field.
 *
 * @since 2.3.0
 *
 * @param string $field   Category key to sanitize.
 * @param mixed  $value   Category value to sanitize.
 * @param int    $cat_id  Category ID.
 * @param string $context What filter to use, &#039;raw&#039;, &#039;display&#039;, etc.
 * @return mixed Value after $value has been sanitized.
 */
function sanitize_category_field( $field, $value, $cat_id, $context ) {
	return sanitize_term_field( $field, $value, $cat_id, &#039;category&#039;, $context );
}

/* Tags */

/**
 * Retrieves all post tags.
 *
 * @since 2.3.0
 *
 * @param string|array $args {
 *     Optional. Arguments to retrieve tags. See get_terms() for additional options.
 *
 *     @type string $taxonomy Taxonomy to retrieve terms for. Default &#039;post_tag&#039;.
 * }
 * @return WP_Term[]|int|WP_Error Array of &#039;post_tag&#039; term objects, a count thereof,
 *                                or WP_Error if any of the taxonomies do not exist.
 */
function get_tags( $args = &#039;&#039; ) {
	$defaults = array( &#039;taxonomy&#039; =&gt; &#039;post_tag&#039; );
	$args     = wp_parse_args( $args, $defaults );

	$tags = get_terms( $args );

	if ( empty( $tags ) ) {
		$tags = array();
	} else {
		/**
		 * Filters the array of term objects returned for the &#039;post_tag&#039; taxonomy.
		 *
		 * @since 2.3.0
		 *
		 * @param WP_Term[]|int|WP_Error $tags Array of &#039;post_tag&#039; term objects, a count thereof,
		 *                                     or WP_Error if any of the taxonomies do not exist.
		 * @param array                  $args An array of arguments. See {@see get_terms()}.
		 */
		$tags = apply_filters( &#039;get_tags&#039;, $tags, $args );
	}

	return $tags;
}

/**
 * Retrieves a post tag by tag ID or tag object.
 *
 * If you pass the $tag parameter an object, which is assumed to be the tag row
 * object retrieved from the database, it will cache the tag data.
 *
 * If you pass $tag an integer of the tag ID, then that tag will be retrieved
 * from the database, if it isn&#039;t already cached, and passed back.
 *
 * If you look at get_term(), both types will be passed through several filters
 * and finally sanitized based on the $filter parameter value.
 *
 * @since 2.3.0
 *
 * @param int|WP_Term|object $tag    A tag ID or object.
 * @param string             $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
 *                                   correspond to a WP_Term object, an associative array, or a numeric array,
 *                                   respectively. Default OBJECT.
 * @param string             $filter Optional. How to sanitize tag fields. Default &#039;raw&#039;.
 * @return WP_Term|array|WP_Error|null Tag data in type defined by $output parameter.
 *                                     WP_Error if $tag is empty, null if it does not exist.
 */
function get_tag( $tag, $output = OBJECT, $filter = &#039;raw&#039; ) {
	return get_term( $tag, &#039;post_tag&#039;, $output, $filter );
}

/* Cache */

/**
 * Removes the category cache data based on ID.
 *
 * @since 2.1.0
 *
 * @param int $id Category ID
 */
function clean_category_cache( $id ) {
	clean_term_cache( $id, &#039;category&#039; );
}

/**
 * Updates category structure to old pre-2.3 from new taxonomy structure.
 *
 * This function was added for the taxonomy support to update the new category
 * structure with the old category one. This will maintain compatibility with
 * plugins and themes which depend on the old key or property names.
 *
 * The parameter should only be passed a variable and not create the array or
 * object inline to the parameter. The reason for this is that parameter is
 * passed by reference and PHP will fail unless it has the variable.
 *
 * There is no return value, because everything is updated on the variable you
 * pass to it. This is one of the features with using pass by reference in PHP.
 *
 * @since 2.3.0
 * @since 4.4.0 The `$category` parameter now also accepts a WP_Term object.
 * @access private
 *
 * @param array|object|WP_Term $category Category row object or array.
 */
function _make_cat_compat( &amp;$category ) {
	if ( is_object( $category ) &amp;&amp; ! is_wp_error( $category ) ) {
		$category-&gt;cat_ID               = $category-&gt;term_id;
		$category-&gt;category_count       = $category-&gt;count;
		$category-&gt;category_description = $category-&gt;description;
		$category-&gt;cat_name             = $category-&gt;name;
		$category-&gt;category_nicename    = $category-&gt;slug;
		$category-&gt;category_parent      = $category-&gt;parent;
	} elseif ( is_array( $category ) &amp;&amp; isset( $category[&#039;term_id&#039;] ) ) {
		$category[&#039;cat_ID&#039;]               = &amp;$category[&#039;term_id&#039;];
		$category[&#039;category_count&#039;]       = &amp;$category[&#039;count&#039;];
		$category[&#039;category_description&#039;] = &amp;$category[&#039;description&#039;];
		$category[&#039;cat_name&#039;]             = &amp;$category[&#039;name&#039;];
		$category[&#039;category_nicename&#039;]    = &amp;$category[&#039;slug&#039;];
		$category[&#039;category_parent&#039;]      = &amp;$category[&#039;parent&#039;];
	}
}
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