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Definition and Usage

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The eval() function evaluates a
string as PHP code.
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The string
must be valid PHP code and must end with semicolon.
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This function returns NULL unless a return statement is
called in the code string. Then the value passed to return is returned.
If there is a parse error in the code string, eval() returns FALSE.
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ÁËÔÚ´úÂë×Ö·û´®ÖÐÇëÇó“·µ»ØÓï¾ä[return
statement]”µÄÇé¿ö£¬ÔÚÆäËüÇé¿öÏ£¬Õâ¸öº¯Êý¶¼½«·µ»Ø¿ÕÖµ[NULL]£»Èç¹ûÇëÇóÁË“·µ»ØÓï¾ä”£¬ÄÇôËü½«·µ»Ø±»´«µÝµ½“·µ»ØÓï¾ä”ÖеÄÖµ¡£Èç
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eval()º¯Êý£¬Õâ¸öº¯Êý¿ÉÒÔ°ÑÒ»¸ö×Ö·û´®µ±×÷Ò»¸öJavaScript±í´ïʽһÑùÈ¥Ö´ÐÐËü¡£
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ob_start() ob_end_clean() ob_get_contents()
(2008-12-19 16:17:41)
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ʹÓÃob_start()°ÑÊä³öÄÚÈÝÊä³öµ½»º³åÇø£¬¶ø²»Êǵ½ä¯ÀÀÆ÷¡£
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ob_start()ÔÚ·þÎñÆ÷´ò¿ªÒ»¸ö»º³åÇøÀ´±£´æËùÓеÄÊä³ö¡£ËùÒÔÔÚÈκÎʱºòʹ
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£¬Êä³ö¶¼½«±»¼ÓÈ뻺³åÇøÖУ¬Ö±µ½³ÌÐòÔËÐнáÊø»òÕßʹÓÃob_flush()À´½áÊø¡£È»ºóÔÚ·þÎñÆ÷Öлº³åÇøµÄÄÚÈݲŻᷢË͵½ä¯ÀÀÆ÷£¬ÓÉä¯ÀÀÆ÷À´½âÎöÏÔʾ¡£
º¯Êýob_end_clean
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ob_start(); // buf1
echo ' multiple ';
ob_start(); // buf2
echo ' buffers work ';
$buf2 = ob_get_contents();
ob_end_clean();
$buf1 = ob_get_contents();
ob_end_clean();
echo $buf1;
echo '<br/>';
echo $buf2;
function
format_js($string ,$isjs){
$string =
addslashes(str_replace(array('\n','\r'),array('',''),$string));
return $isjs?'document.wirte("$string");':$str


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