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   1  <?php
   2  /**
   3   * Functions, which make work with strings easier
   4   */
   5  
   6  function gp_startswith( $haystack, $needle ) {
   7      return 0 === strpos( $haystack, $needle );
   8  }
   9  
  10  function gp_endswith( $haystack, $needle ) {
  11      return $needle === substr( $haystack, -strlen( $needle ));
  12  }
  13  
  14  function gp_in( $needle, $haystack ) {
  15      return false !== strpos( $haystack, $needle );
  16  }
  17  
  18  /**
  19   * Adds a slash after the string, while makes sure not to double it
  20   * if it already exists
  21   */
  22  function gp_add_slash( $string ) {
  23      return rtrim( $string, '/' ) . '/';
  24  }
  25  
  26  if ( function_exists('mb_strtolower') ):
  27  function gp_strtolower( $str ) {
  28      return mb_strtolower( $str );
  29  }
  30  else:
  31  function gp_strtolower( $str ) {
  32      return strtolower( $str );
  33  }
  34  endif;
  35  
  36  if ( function_exists('mb_strlen') ):
  37  function gp_strlen( $str ) {
  38      return mb_strlen( $str );
  39  }
  40  else:
  41  function gp_strlen( $str ) {
  42      return preg_match_all("/.{1}/us", $str, $dummy);
  43  }
  44  endif;
  45  
  46  function gp_sanitize_for_url( $name ) {
  47      $name = trim( $name );
  48      $name = gp_strtolower( $name );
  49      $name = preg_replace( '/&.+?;/', '', $name ); // kill entities
  50      $name = str_replace( '.', '-', $name );
  51      $name = preg_replace('|[#$%&~/.\-;:=,?@\[\]+]|', '', $name);
  52      $name = preg_replace( '/\s+/', '-', $name );
  53      $name = preg_replace( '|-+|', '-', $name );
  54      $name = trim($name, '-');
  55      return $name;
  56  }
  57  
  58  /**
  59   * Similar to {@link esc_attr()}, but double encode entities
  60   */
  61  function gp_esc_attr_with_entities( $text ) {
  62      $safe_text = wp_check_invalid_utf8( $text );
  63      $safe_text = _wp_specialchars( $safe_text, ENT_QUOTES, false, true );
  64      return apply_filters( 'attribute_escape', $safe_text, $text );
  65      
  66  }