what is wrong with this code?

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  • Kees
    #1

    what is wrong with this code?

    I was under the impression that the single quote ' did not interpret
    the content.

    prog 1
    <HTML>
    <BODY>
    <?PHP
    echo '"a"';
    ?>
    </BODY>
    </HTML>
    this gives as expected "a"

    prog 2
    <HTML>
    <BODY>
    <?PHP
    echo '"<a"';
    ?>
    </BODY>
    </HTML>
    I want "<a" but
    it gives "<a>
    So without the closing " but with a closing >

    Strange. What am I doing wrong?

    Greeting
    Kees



    Tags: None
    • Ken Robinson
      #2
      Re: what is wrong with this code?


      Kees wrote:[color=blue]
      > prog 2
      > <HTML>
      > <BODY>
      > <?PHP
      > echo '"<a"';
      > ?>
      > </BODY>
      > </HTML>
      > I want "<a" but
      > it gives "<a>
      > So without the closing " but with a closing >
      >
      > Strange. What am I doing wrong?[/color]

      Try:

      <?
      echo '"&lt;a&gt;" ';
      ?>

      Ken

        Comment

        • John Dunlop
          #3
          Re: what is wrong with this code?

          Kees wrote:
          [color=blue]
          > prog 2
          > <HTML>
          > <BODY>
          > <?PHP
          > echo '"<a"';
          > ?>
          > </BODY>
          > </HTML>
          > I want "<a" but
          > it gives "<a>
          > So without the closing " but with a closing >[/color]

          No, that isn't the output. The output is exactly what you
          thought it should be; that is, "<a".

          However, browsers understand '<' to be the start of a tag if
          it is followed by a Name Start Character. A browser would
          then read the 'a' but get confused when it comes across '"',
          which isn't a valid Name character in HTML. It looks as
          though error recovery kicked in and everything up until the
          '>' of '</BODY>' was ignored. Thus, you were presented with
          "<a> by your web browser.

          When '<' comes immediately before a Name Start Character,
          such as 'a', it needs to be encoded, either with &lt;, &#60;
          or &#x3C;, if it is to be taken literally. The
          htmlspecialchar s function converts '<' to &lt;.

          PHP: htmlspecialchars - Manual
          http://www.php.net/manual/en/function.htmlspecialchars.php
          Convert special characters to HTML entities


          --
          Jock

            Comment

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