实锟矫的脚憋拷

锟斤拷锟斤拷锟斤拷锟斤拷写一些锟斤拷实锟矫的脚憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟揭筹拷锟侥凤拷锟斤拷锟斤拷锟斤拷锟斤拷什么锟斤拷锟斤拷锟斤拷锟揭拷锏斤拷锟斤拷目锟侥ｏ拷锟斤拷要锟斤拷锟斤拷没锟斤拷锟� agent 锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷偷锟� HTTP 锟斤拷锟斤拷锟揭伙拷锟斤拷帧锟斤拷锟斤拷锟较拷锟斤拷娲拷锟揭伙拷锟�锟斤拷锟斤拷锟叫★拷锟斤拷 PHP 锟叫ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷元锟斤拷锟斤拷头锟斤拷锟斤拷锟斤拷锟斤拷锟节革拷锟斤拷趣锟侥憋拷锟斤拷锟斤拷 $_SERVER['HTTP_USER_AGENT']锟斤拷

Note:
$_SERVER 锟斤拷一锟斤拷锟斤拷锟斤拷锟� PHP 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 web 锟斤拷锟斤拷锟斤拷锟结供锟斤拷锟斤拷锟斤拷锟斤拷息锟斤拷锟斤拷锟斤拷为锟斤拷全锟街憋拷锟斤拷锟斤拷锟斤拷锟斤拷谋锟斤拷植锟�"锟斤拷全锟街憋拷锟斤拷"锟叫碉拷锟叫癸拷锟斤拷锟斤拷锟皆伙拷取锟斤拷锟斤拷锟斤拷息锟斤拷锟斤拷些锟斤拷锟斤拷谋锟斤拷锟斤拷锟斤拷锟� PHP » 4.1.0 锟芥本锟斤拷锟斤拷摹锟斤拷锟斤拷锟街笆癸拷锟� $HTTP_*_VARS 锟斤拷锟介，锟斤拷 $HTTP_SERVER_VARS锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟窖撅拷锟斤拷锟斤拷锟剿ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟铰版本锟斤拷锟斤拷然锟斤拷锟节ｏ拷锟轿硷拷"锟缴达拷锟斤拷"一锟斤拷锟叫碉拷注锟解）锟斤拷

要锟斤拷示锟矫憋拷锟斤拷锟斤拷只锟斤拷虻サ亟锟斤拷锟斤拷锟斤拷虏锟斤拷锟斤拷锟�

Example #1 锟斤拷印一锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷元锟截ｏ拷


<?php 
echo $_SERVER['HTTP_USER_AGENT']; 
?>

锟矫脚憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷牵锟�

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)

PHP 锟叫很讹拷锟街诧拷同锟斤拷锟斤拷锟侥憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟角达拷印锟斤拷一锟斤拷锟斤拷锟斤拷锟侥碉拷元锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷浅锟斤拷锟斤拷玫谋锟斤拷锟斤拷锟�

$_SERVER 只锟斤拷 PHP 锟皆讹拷全锟街伙拷锟侥憋拷锟斤拷之一锟斤拷锟斤拷锟皆诧拷锟斤拷"预锟斤拷锟斤拷锟斤拷锟�"一锟斤拷锟斤拷锟介看锟斤拷些锟斤拷锟斤拷锟斤拷锟叫憋拷锟斤拷锟斤拷也锟斤拷锟斤拷通锟斤拷锟较斤拷锟斤拷锟斤拷锟斤拷 phpinfo() 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷榭达拷锟�

锟斤拷锟斤拷锟斤拷一锟斤拷 PHP 锟斤拷识锟叫硷拷锟斤拷锟斤拷 PHP 锟斤拷洌诧拷锟斤拷越锟斤拷锟揭伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟饺简单碉拷 echo 锟斤拷锟斤拷锟斤拷锟斤拷椤ｏ拷锟斤拷纾拷锟斤拷锟斤拷要识锟斤拷 Internet Explorer锟斤拷锟斤拷锟皆斤拷锟斤拷锟斤拷锟铰诧拷锟斤拷锟斤拷

Example #2 锟斤拷锟教匡拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷使锟斤拷


<?php
if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== FALSE) {
    echo '锟斤拷锟斤拷使锟斤拷 Internet Explorer锟斤拷<br />';
}
?>

锟矫脚憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷牵锟�

锟斤拷锟斤拷使锟斤拷 Internet Explorer锟斤拷<br />

锟斤拷锟斤拷要锟斤拷锟斤拷一些锟铰碉拷原锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷 if 锟斤拷洹ｏ拷锟斤拷锟矫伙拷锟斤拷 C 锟斤拷锟皆的伙拷锟斤拷锟斤法锟饺斤拷锟斤拷悉锟斤拷锟斤拷应锟矫对此猴拷锟斤拷悉锟斤拷锟斤拷锟津，匡拷锟斤拷锟斤拷要锟斤拷锟斤拷锟轿猴拷一锟斤拷 PHP 锟斤拷锟斤拷锟皆碉拷锟介籍锟斤拷锟侥讹拷前锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷陆冢锟斤拷锟斤拷锟揭诧拷锟斤拷锟斤拷亩锟斤拷锟斤拷植锟斤拷"锟斤拷锟皆参匡拷"一锟铰★拷

锟斤拷要锟斤拷锟杰的第讹拷锟斤拷原锟斤拷锟角讹拷 strpos() 锟斤拷锟斤拷锟侥碉拷锟矫★拷strpos() 锟斤拷 PHP 锟斤拷一锟斤拷锟斤拷锟矫猴拷锟斤拷锟斤拷锟戒功锟斤拷锟斤拷锟斤拷一锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷要锟斤拷 $_SERVER['HTTP_USER_AGENT']锟斤拷锟斤拷锟斤拷谓锟斤拷 haystack锟斤拷锟斤拷锟斤拷锟斤拷寻锟斤拷 'MSIE'锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 haystack 锟叫革拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷谓锟斤拷 needle锟斤拷锟斤拷锟揭碉拷锟斤拷"锟斤拷锟斤拷寻锟斤拷"锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 needle 锟斤拷 haystack 锟斤拷锟斤拷锟斤拷诳锟酵凤拷锟轿伙拷茫锟斤拷锟斤拷没锟叫ｏ拷锟津返伙拷 FALSE锟斤拷锟斤拷锟斤拷煤锟斤拷锟矫伙拷蟹锟斤拷锟� FALSE锟斤拷锟斤拷 if 锟结将锟斤拷锟斤拷锟叫讹拷为 TRUE 锟斤拷锟斤拷锟斤拷锟戒花锟斤拷锟斤拷 {} 锟节的达拷锟诫；锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷些锟斤拷锟诫。锟斤拷锟斤拷锟皆硷拷锟斤拷锟斤拷锟斤拷锟斤拷 if锟斤拷else 锟皆硷拷锟斤拷锟斤拷锟侥猴拷锟斤拷锟斤拷 strtoupper() 锟斤拷 strlen() 锟斤拷锟斤拷锟斤拷锟斤拷锟狡的脚憋拷锟斤拷锟节憋拷锟街诧拷锟斤拷锟斤拷氐锟揭筹拷锟揭诧拷锟斤拷锟斤拷蟹锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟绞癸拷煤锟斤拷锟斤拷锟斤拷呛锟饺凤拷锟斤拷锟斤拷锟斤拷锟斤拷亩锟斤拷植锟斤拷锟斤拷泄锟�"锟斤拷锟斤拷亩锟斤拷锟斤拷锟斤拷亩锟斤拷锟�"锟斤拷"锟斤拷锟斤拷"锟斤拷锟叫癸拷锟铰节★拷

锟斤拷锟斤拷锟斤拷锟角斤拷一锟斤拷锟斤拷示锟斤拷谓锟斤拷锟� PHP 模式锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷 PHP 锟斤拷锟斤拷锟斤拷锟叫间：

Example #3 锟斤拷锟� HTML 锟斤拷 PHP 模式


<?php
if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== FALSE) {
?>
<h3>strpos() 锟较讹拷没锟叫凤拷锟截硷拷 (FALSE)</h3>
<p>锟斤拷锟斤拷使锟斤拷 Internet Explorer</p>
<?php
} else {
?>
<h3>strpos() 锟较讹拷锟斤拷锟截硷拷 (FALSE)</h3>
<center><b>没锟斤拷使锟斤拷 Internet Explorer</b></center>
<?php
}
?>

锟矫脚憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷牵锟�

<h3>strpos() 锟较讹拷没锟叫凤拷锟截硷拷 (FALSE)</h3>
<p>锟斤拷锟斤拷使锟斤拷 Internet Explorer</p>

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷 PHP 锟斤拷 echo 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷同锟斤拷锟角ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 PHP 模式锟斤拷直锟斤拷写 HTML 锟斤拷锟诫。锟斤拷锟斤拷锟街碉拷锟阶拷锟斤拷一锟斤拷锟角ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷裕锟斤拷疟锟斤拷锟斤拷呒锟叫э拷锟斤拷锟斤拷锟酵拷摹锟斤拷锟斤拷卸锟斤拷锟� strpos() 锟斤拷锟斤拷锟侥凤拷锟斤拷值锟斤拷 TRUE 锟斤拷锟斤拷 FALSE锟斤拷也锟斤拷锟斤拷锟叫讹拷锟斤拷锟街凤拷锟斤拷 'MSIE' 锟角凤拷锟揭碉拷之锟斤拷锟斤拷锟斤拷只锟斤拷一锟斤拷 HTML 锟介被锟斤拷锟酵革拷锟斤拷锟斤拷摺锟�