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1 echo();2 print();3 die();4 printf();5 sprintf();6 print_r();7 var_dump();
1 echo()
  ¿ÉÒÔͬʱÊä³ö¶à¸ö×Ö·û´®,¿ÉÒÔ¶à¸ö²ÎÊý,²¢²»ÐèÒªÔ²À¨ºÅ,ÎÞ·µ»ØÖµ¡£
2 print()
  Ö»¿ÉÒÔͬʱÊä³öÒ»¸ö×Ö·û´®£¬Ò»¸ö²ÎÊý,ÐèÒªÔ²À¨ºÅ,Óзµ»ØÖµ,µ±ÆäÖ´ÐÐʧ°Üʱ·µflase .print  µÄÓ÷¨ºÍCÓïÑÔºÜÏñ£¬ËùÒÔ»á¶ÔÊä³öÄÚÈÝÀïµÄ%×öÌØÊâ½âÊÍ¡£
3 die();
   ÓÐÁ½¸ö¹¦ÄÜ£ºÏÈÊä³öÄÚÈÝ£¬È»ºóÍ˳ö³ÌÐò¡££¨³£ÓÃÔÚÁ´½Ó·þÎñÆ÷£¬Êý¾Ý¿â£©
   mysql_connect("locahost","root","root") or die("Á´½Ó·þÎñÆ÷ʧ°Ü£¡");
4 printf();
   printf("²ÎÊý1",²ÎÊý2)£º²ÎÊý1=°´Ê²Ã´¸ñʽÊä³ö£»²ÎÊý2=Êä³öµÄ±äÁ¿¡£($s:°´×Ö·û´®;$d:°´ÕûÐÍ;$b:°´¶þ½øÖÆ£»$x:°´16½øÖÆ£»$o:°´°Ë½øÖÆ; $f:°´¸¡µãÐÍ)
   <?php
     $num=100.001;
     printf("%d",$num);  //100
     printf("%s",$num);  //100.001
     printf("%s---%d---%b---%x---%o---%f",$num,$num,$num,$num,$num,$num)
     //100.001---100---1100100---64---144---1001.00100
     printf("%.2f",$num);  //100.00 (СÊýµã±£Áô2λ)
     printf("%.1f",$num);  //100.0 (СÊýµã±£Áô1λ)
     printf("%`#10s",$num); //###100.001
     printf("%`@10s",$num); //@@@100.001
     printf("%`_10s",$num); //___100.001
     printf("%`#-10s",$num); //100.001###
     printf("%`@-10s",$num); //100.001@@@
     printf("%`_-10s",$num); //100.001___
     printf("%`#20s",$num); //#############100.001
   ?>
5 sprintf();
   ´Ë²¢²»ÄÜÖ±½ÓÊä³ö,Ïȸ³¸øÒ»¸ö±äÁ¿£¬È»ºóÔÙÊä³ö±äÁ¿¡£
   <?php
     $num=100.001;
     $a=sprintf("%d",$num);
     echo $a;  //100
    ?>
6 print_r();
   ¹¦ÄÜ£ºÖ»ÓÃÓÚÊä³öÊý×é¡£
7


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if(ereg("^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$",$ip)) {
echo $ip;
} else {
echo "unknown";
}
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