doudi8298 2009-09-11 14:00
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使用会话 - PHP

When working with Sessions, do you need to declare session_start() or ob_start() ? What are the advantages of doing so or not doing so?

Thank you!

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  • dqnf28092 2009-09-11 14:02
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    session_start() must be used to store and read from the $_SESSION global.

    ob_start() is completely separate from sessions. ob_start() triggers output buffering which stores all output in a buffer for later use. When a PHP script ends, the buffer is automatically flushed to the user. Alternatively, you can fetch the contents of the buffer mid-execution and tweak the contents. See example below.

    Example from php.net:

    <?php
    function callback($buffer)
    {
      // replace all the apples with oranges
      return (str_replace("apples", "oranges", $buffer));
    }
    
    ob_start("callback");
    
    ?>
    <html>
    <body>
    <p>It's like comparing apples to oranges.</p>
    </body>
    </html>
    <?php
    
    ob_end_flush();
    
    ?>
    

    Output:

    <html>
    <body>
    <p>It's like comparing oranges to oranges.</p>
    </body>
    </html>
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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