Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

PHPÊý¾ÝÀàÐÍת»»

PHPÊý¾ÝÀàÐÍת»»
PHPµÄÊý¾ÝÀàÐÍת»»ÊôÓÚÇ¿ÖÆ×ª»»£¬ÔÊÐíת»»µÄPHPÊý¾ÝÀàÐÍÓУº
£¨int£©¡¢£¨integer£©£º×ª»»³ÉÕûÐÎ
£¨float£©¡¢£¨double£©¡¢£¨real£©£º×ª»»³É¸¡µãÐÍ
£¨string£©£º×ª»»³É×Ö·û´®
£¨bool£©¡¢£¨boolean£©£º×ª»»³É²¼¶ûÀàÐÍ
£¨array£©£º×ª»»³ÉÊý×é
£¨object£©£º×ª»»³É¶ÔÏó
PHPÊý¾ÝÀàÐÍÓÐÈýÖÖת»»·½Ê½£º
ÔÚҪת»»µÄ±äÁ¿Ö®Ç°¼ÓÉÏÓÃÀ¨ºÅÀ¨ÆðÀ´µÄÄ¿±êÀàÐÍ
ʹÓÃ3¸ö¾ßÌåÀàÐ͵Äת»»º¯Êý£¬intval()¡¢floatval()¡¢strval()
ʹÓÃͨÓÃÀàÐÍת»»º¯Êýsettype(mixed var,string type)
 µÚÒ»ÖÖת»»·½Ê½£º (int)  (bool)  (float)  (string)  (array) (object)
Îı¾²é¿´¸´ÖÆ´úÂë´òÓ¡¹ØÓÚ
<?php   
$num1=3.14;   
$num2=(int)$num1;   
var_dump($num1); //Êä³öfloat(3.14)   
var_dump($num2); //Êä³öint(3)   
?>  
<?php
$num1=3.14;
$num2=(int)$num1;
var_dump($num1); //Êä³öfloat(3.14)
var_dump($num2); //Êä³öint(3)
?>
µÚ¶þÖÖת»»·½Ê½£º  intval()  floatval()  strval()
Îı¾²é¿´¸´ÖÆ´úÂë´òÓ¡¹ØÓÚ
<?php   
$str="123.9abc";   
$int=intval($str);     //ת»»ºóÊýÖµ£º123   
$float=floatval($str); //ת»»ºóÊýÖµ£º123.9   
$str=strval($float);   //ת»»ºó×Ö·û´®£º"123.9"    
?>  
<?php
$str="123.9abc";
$int=intval($str); //ת»»ºóÊýÖµ£º123
$float=floatval($str); //ת»»ºóÊýÖµ£º123.9
$str=strval($float); //ת»»ºó×Ö·û´®£º"123.9"
?>
µÚÈýÖÖת»»·½Ê½£º  settype();
Îı¾²é¿´¸´ÖÆ´úÂë´òÓ¡¹ØÓÚ
<?php   
$num4=12.8;   
$flg=settype($num4,"int");   
var_dump($flg);  //Êä³öbool(true)   
var_dump($num4); //Êä³öint(12)   
?>  
<?php
$num4=12.8;
$flg=settype($num4,"int");
var_dump($flg); //Êä³öbool(true)
var_dump($num4); //Êä³öint(12)
?>
365PHPÃâ·ÑÊÓÆµ½Ì³ÌÏÂÔØ£º  PHP½Ì³ÌÊÓÆµ,Ãâ·ÑÊÓÆµÏÂÔØ -PHPÊý¾ÝÀàÐÍת»»
×÷ÕߣºÂíÃ÷@PHPÅàѵ PHPÐÞ¶©1.0 2009-09
365PHP£¬ÖйúPHPÔÚÏßÅàѵ


Ïà¹ØÎĵµ£º

PHPÏÂeregʵÏÖÆ¥ÅäipµÄÕýÔò


$ip = "1.1.1.255".chr(0)."haha";
if(ereg("^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$",$ip)) {
echo $ip;
} else {
echo "unknown";
}
Õâ¸öeregÕýÔòÏÞÖÆÁË$ipµÄÊý¾ÝΪxxx.xxx.xxx.xxxÕâÑùµÄÐÎʽ£¬±íÃæÉÏ¿´ÉÏÃæµÄ´úÂëÓ¦¸ÃÊä³ö"unknown"£¬¶øÊµ¼ÊÈ´Êä³öÁË"1.1.1.255haha"£¬ÒòΪeregº¯Êý´æÔÚNULL½Ø¶Ï ......

phpħÊõ·½·¨

class lamp
 {
   public function __construct()  
{
  }
  
  public function __get($var) //»ñÈ¡²»´æÔÚµÄÊôÐÔʱµ÷ÓÃ
  {
   echo "²»´æÔÚ±äÁ¿$var<br>";
  }
  public function __set($var ......

PHP±í´ïʽÓëÔËËã·û

PHP±í´ïʽ
±í´ïʽÊdz£Á¿¡¢±äÁ¿ºÍÔËËã·ûµÄ×éºÏ
±í´ïʽÊÇPHPÖеÄÖØÒªÄÚÈÝ£¬PHPÖм¸ºõËùÓеĶ«Î÷¶¼¿ÉÒÔ³ÆÎª±í´ïʽ
$x=10;
$y=($x=10);
$y+=($x=10);
$z=&$x;
$condition?$true_item:$false_item;
PHPÔËËã·û
ÔËËã·ûÊÇÓÃÀ´¶ÔÊýÖµ»ò±äÁ¿½øÐÐijÖÖ²Ù×÷ÔËËãµÄ·ûºÅ¡£Ò»°ãµØËµ£¬ÔËËã·û¿ÉÒÔ´øÓÐ1¸ö¡¢2¸ö»òÕ߸ü¶à¸öÔËË ......

PHPÊý¾ÝÀàÐÍת»»Ï¸½Ú

PHPÊý¾ÝÀàÐÍת»»Ï¸½Ú
1¡¢Êý×Ö£¨ÕûÐκ͸¡µãÐÍÖ®¼ä¿ÉÒÔÏ໥ת»¯£©
ÕûÐÎת»»Îª¸¡µãÐÍ£ºÓÉÓÚ¸¡µãÐ͵ľ«¶È·¶Î§Ô¶´óÓÚÕûÐΣ¬ËùÒÔת»»ºóµÄÊýÖµ¾«¶È²»»á¸Ä±ä¡£
¸¡µãÐÍת»»ÎªÕûÐΣº½²×Ô¶¯ÉáÆúСÊ÷²¿·Ö£¬Ö»±£ÁôÕûÊý²¿·Ö¡£×¢£ºÈç¹ûÒ»¸ö¸¡µãÐͳ¬¹ýÕûÊýȡֵµÄÓÐЧ·¶Î§£¬Æä½á¹û½«ÊÇÎÞ·¨È·¶¨µÄ£¨ÕûÊýµÄ×î´óÖµÔ¼ÊÇ2.147e9£©¡£
¡¾Ê¾Àý¡ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ