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ceil -- ½øÒ»·¨È¡Õû
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float ceil ( float value )
·µ»Ø²»Ð¡ÓÚ value µÄÏÂÒ»¸öÕûÊý£¬value Èç¹ûÓÐСÊý²¿·ÖÔò½øÒ»Î»¡£ceil() ·µ»ØµÄÀàÐÍÈÔÈ»ÊÇ float£¬ÒòΪ float ÖµµÄ·¶Î§Í¨³£±È integer Òª´ó¡£
Àý×Ó 1. ceil() Àý×Ó
<?php
echo ceil(4.3); // 5
echo ceil(9.999); // 10
?>
floor -- ÉáÈ¥·¨È¡Õû
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float floor ( float value )
·µ»Ø²»´óÓÚ value µÄÏÂÒ»¸öÕûÊý£¬½« value µÄСÊý²¿·ÖÉáȥȡÕû¡£floor() ·µ»ØµÄÀàÐÍÈÔÈ»ÊÇ float£¬ÒòΪ float ÖµµÄ·¶Î§Í¨³£±È integer Òª´ó¡£
Àý×Ó 1. floor() Àý×Ó
<?php
echo floor(4.3); // 4
echo floor(9.999); // 9
?>
round -- ¶Ô¸¡µãÊý½øÐÐËÄÉáÎåÈë
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float round ( float val [, int precision] ) ·µ»Ø½« val ¸ù¾ÝÖ¸¶¨¾«¶È precision£¨Ê®½øÖÆÐ¡ÊýµãºóÊý×ÖµÄÊýÄ¿£©½øÐÐËÄÉáÎåÈëµÄ½á¹û¡£precision Ò²¿ÉÒÔÊǸºÊý»òÁ㣨ĬÈÏÖµ£©¡£
Àý×Ó 1. round() Àý×Ó
<?php
echo round(3.4); // 3
echo round(3.5); // 4
echo round(3.6); // 4
echo round(3.6, 0); // 4
echo round(1.95583, 2); // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2); // 5.05
echo round(5.055, 2); // 5.06
?>
intval---¶Ô±äÊýת³ÉÕûÊýÐÍ̬
Àý×Óintval()
<?php
echo intval(4.3); //4
echo intval(4.6); // 4
?>


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