PHP test page indexphp phpinfo blank problem

• PHP version 5.3.3

• The original test file index.php, the page is blank.

<code><span><?</span>
        phpinfo();
    <span>?></span></code>

• After the change, the test file index.php, the page is normal.

<code><span><?php</span>
        phpinfo();
    <span>?></span></code>

• Summary
  PHP syntax updated, every other line is like a mountain!

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