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1¡¢if Ìõ¼þÓï¾ä
if(expr)
    echo TRUE
else
    echo FALSE
if(expr) {
    echo TRUE
}else{
    echo FALSE
}
f(expr) {
    echo TRUE
}
elseif(expr) {
    echo CON
}else{
    echo FALSE
}
2.switch Ìõ¼þÓï¾ä
switch ($i) {
    case 0:
        echo "Êä³ö 0";
        break;
    case 1:
        echo "Êä³ö 1";
        break;
    case 2:
        echo "Êä³ö 2";
        break;
}
µÈ¼ÛÓÚ£º
f ($i == 0) {
    echo "Êä³ö 0";
} elseif ($i == 1) {
    echo "Êä³ö 1";
} elseif ($i == 2) {
    echo "Êä³ö 2";
}
ÒÔÏÂÊÇÔ´Â룺
<?php
/*
* ÿÌìÒ»µãµã£¬¾ÍÄÜѧºÃphp
* Author: CHAUVET;
* Date: 2009-12-30;
* Function: ÑÝʾÌõ¼þÓï¾ä
*/
$iNum=4;
if($iNum==4){
echo "ÕýÈ·";
}else{
echo "´íÎó";
}
print "<br/>";
$answer='A';
if($answer=='A'){
print "ÄúÑ¡ÖÐÁËA";
}elseif($answer=='B'){
print "ÄúÑ¡ÖÐÁËB";
}else if($answer=='C'){
print "ÄúÑ¡ÖÐÁËC";
}else{
print "ÄúÑ¡ÖÐÁËD";
}
print "<br/>";
#µÈ¼ÛÓÚ
switch($answer){
case 'A':
echo "ÄúÑ¡ÖÐÁËA";
break;
case 'B':
echo "ÄúÑ¡ÖÐÁËB";
break;
case 'C':
echo "ÄúÑ¡ÖÐÁËC";
break;
case'D':
echo "ÄúÑ¡ÖÐÁËD";
break;
default:
echo "ÄúûÓÐÑ¡ÖÐÈκζ«Î÷";
}
print '<br/>


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{
//º¯ÊýÓë±äÁ¿µÄ¼¯ºÏ(һЩ±äÁ¿(Àà³ÉÔ±)ºÍº¯Êý(ÐÐΪ·½·¨)µÄ¶¨Òå)¡£
}
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<?php
$host = "www.abc.com"; //ÄãÒª·ÃÎʵÄÓòÃû
$target = "/test.asp"; //ÄãÒª·ÃÎʵÄÒ³ÃæµØÖ·
$referer = "http://www.abcdefg.com/abc.html"; //αÔìÀ´Â·Ò³Ãæ
$fp = fsockopen($host, 80, $errno, $errstr, 30);
if (!$fp){
echo "$errstr($errno)<br />\n";
} ......

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