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<?php   
$real_num=3.1e9;   
echo $real_num;   
echo (int)$real_num;  //Êä³öÒ»¸ö²»È·¶¨µÄÖµ,ÒòΪÒç³öµÄ²¿·ÖÒѾ­¶ªÊ§¡£   
?>  
<?php
$real_num=3.1e9;
echo $real_num;
echo (int)$real_num; //Êä³öÒ»¸ö²»È·¶¨µÄÖµ,ÒòΪÒç³öµÄ²¿·ÖÒѾ­¶ªÊ§¡£
?>
2¡¢²¼¶ûÐÍ
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0ת»»Îªfalse
0.0ת»»Îªfalse
¿Õ°××Ö·û""ºÍ×Ö·û´®"0"ת»»Îªfalse
ûÓгÉÔ±µÄÊý×éarray()ת»»Îªfalse
NULLת»»Îªfalse
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<?php   
$number=intval("5.6abc");    //5   
$number=(float)"+5.6abc";    //5.6   
$number=floatval("-1.2e3f4g5");   //-1.2e3   
  
$result="12.3xy45"-6;   //6.3   
$result="xy1234"/5;     //0   
$result="1.2.3.4"*5;    //6   
$result=1+"-1.3e3";     //-1299   
?>  
<?php
$number=intval("5.6abc"); //5
$number=(float)"+5.6abc"; //5.6
$number=floatval("-1.2e3f4g5"); //-1.2e3
$result="12.3xy45"-6; //6.3
$result="xy1234"/5; //0
$result="1.2.3.4"*5; //6
$result=1+"-1.3e3"; //-1299
?>
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