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msd2/wordpress/wp-content/plugins/amp/includes/utils/class-amp-html-utils.php

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+<?php
+/**
+ * Class AMP_HTML_Utils
+ *
+ * @package AMP
+ */
+
+/**
+ * Class with static HTML utility methods.
+ */
+class AMP_HTML_Utils {
+
+	/**
+	 * Generates HTML markup for a given tag, attributes and content.
+	 *
+	 * @param string $tag_name   Tag name.
+	 * @param array  $attributes Associative array of $attribute => $value pairs.
+	 * @param string $content    Inner content for the generated node.
+	 * @return string HTML markup.
+	 */
+	public static function build_tag( $tag_name, $attributes = array(), $content = '' ) {
+		$attr_string = self::build_attributes_string( $attributes );
+		return sprintf( '<%1$s %2$s>%3$s</%1$s>', sanitize_key( $tag_name ), $attr_string, $content );
+	}
+
+	/**
+	 * Generates a HTML attributes string from given attributes.
+	 *
+	 * @param array $attributes Associative array of $attribute => $value pairs.
+	 * @return string HTML attributes string.
+	 */
+	public static function build_attributes_string( $attributes ) {
+		$string = array();
+		foreach ( $attributes as $name => $value ) {
+			if ( '' === $value ) {
+				$string[] = sprintf( '%s', sanitize_key( $name ) );
+			} else {
+				$string[] = sprintf( '%s="%s"', sanitize_key( $name ), esc_attr( $value ) );
+			}
+		}
+		return implode( ' ', $string );
+	}
+
+	/**
+	 * Checks whether the given string is valid JSON.
+	 *
+	 * @param string $data String hopefully containing JSON.
+	 * @return bool True if the string is valid JSON, false otherwise.
+	 */
+	public static function is_valid_json( $data ) {
+		if ( ! empty( $data ) ) {
+			$decoded = json_decode( $data );
+			if ( function_exists( 'json_last_error' ) ) {
+				return ( json_last_error() === JSON_ERROR_NONE );
+			} else {
+				// For PHP 5.2 back-compatibility.
+				return null !== $decoded;
+			}
+		}
+		return false;
+	}
+}