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ob_get_ length() ·µ»ØÄÚ²¿»º³åµÄ³¤¶È.
ob_end_flush() ½áÊøÊä³ö»º³å, ²¢Êä³ö»º³åÀïµÄÄÚÈÝ. ÔÚÕâÒÔºóµÄÊä³ö¶¼ÊÇÕý³£Êä³ö.
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ob_start();
var_dump($var);
$out = ob_get_contents();
ob_end_clean();
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