php正则表达式模式匹配实例教程

<?php 
$sub = "www.jb200.com"; 

$ptn = '/w*.w*.w*/'; 

// 正则表达式,元数据,返回的数据 
preg_match($ptn, $sub,$mats); 

echo "<pre>"; 
print_r($mats); 
echo "</pre>"; 
?>
//匹配ip
<?php  
$str = "my ip is 192.168.10.1sdjlfajdf192.178.39.4la"; 

$ptn = '/d+.d+.d+.d+/'; 
preg_match_all($ptn, $str,$mats); 

echo "<pre>"; 
print_r($mats); 
echo "</pre>"; 

?> 
 

<?php  
$str = "linux and php are lamp or linux is very  much"; 
$ptn = '/linux/i'; 
preg_match_all($ptn, $str,$mats); 
echo "<pre>"; 
print_r($mats); 
echo "</pre>"; 
?> 

<?php  
$str = "Linux and php are lamp or nlinux is very  much"; 
$ptn = '/^linux/im'; 
preg_match_all($ptn, $str,$mats); 
echo "<pre>"; 
print_r($mats); 
echo "</pre>"; 
?> 

<?php  
$str = "Linux and php are lamp or nlinux is very  much"; 
$ptn = '/.*/s'; 
preg_match_all($ptn, $str,$mats); 
echo "<pre>"; 
print_r($mats); 
echo "</pre>"; 
?> 

<?php  
$str = "123 php"; 
$ptn = '/d+s(w+)/e'; 
$rep = 'strtoupper($1)'; 
// preg_match_all($ptn, $str,$mats); 
$str2 = preg_replace($ptn, $rep, $str); 
echo "<pre>"; 
print_r($str2); 
echo "</pre>"; 
?> 

<?php  
$str = "123 php"; 
$ptn = '/(d+)(s)(w+)/'; 
$rep = '$3$2$1'; 
// preg_match_all($ptn, $str,$mats); 
$str2 = preg_replace($ptn, $rep, $str); 
echo "<pre>"; 
print_r($str2); 
echo "</pre>"; 
?> 

<?php  
//比如代表文章 
$arr = array( 
"php html", 
" linux redhat rhce", 
"junzaivip test php", 
); 
//需要搜索的内容 
$ptn = '/junzaivip/'; 
//返回搜索到的内容 
$arr2 = preg_grep($ptn, $arr); 
echo "<pre>"; 
print_r($arr2); 
echo "</pre>"; 
?> 

<?php  
echo max(3,45,6,7); 
echo "<br>"; 
echo max(array(4,6,8,9)); 
?> 

//calc打开计算器
时间的起源点:
<?php  
echo time(); 
echo "<hr>"; 
echo date("Y-m-d H:i-s w t",0); 
?> 

<?php  
cho strtotime("2014-12-12"); 
?> 

<?php  
echo date("Y-m-d H:i:s",time()+8*3600); 
?> 

<?php  
//设置中国的时区为默认时区 
date_default_timezone_set("PRC"); 
echo date("Y-m-d H:i:s",time()); 
?> 
 

<?php  
//设置中国的时区为默认时区 
date_default_timezone_set("PRC"); 
$y = "1900/1/1"; 
$time = strtotime($y); 

echo date("L",$time); 
?> 
 

<?php  
$stime =  microtime(1);//注意这个位置必须用true,否者无法参与计算 
sleep(1); 
$etime =  microtime(1); 
echo $etime - $stime; 
?> 

<?php  
//修改字符编码 
//header("content-type:text/html;charset=utf-8"); 
date_default_timezone_set("PRC"); 
//获取当前年 
$year = $_GET['y']?$_GET['y']:date('Y'); 
//获取当前月 
$month = $_GET['m']?$_GET['m']:date('m'); 
//获取获取当前月有多少天 
$days =  date('t',strtotime("{$year}-{$month}-1"));//里面必须用双引号 
//当前一号是周几 
$weeks = date('w',strtotime("{$year}-{$month}-1")); 
//所有有内容居中 
echo "<center>"; 
//输出表头 
echo "<h2>{$year}年{$month}月</h2>"; 
//输出日期表格 
echo "<table width='700px' border='1px'>"; 
//输出第一行 
echo "<tr>"; 
//表头单元格由th来创建 
echo "<th>日</th>"; 
echo "<th>一</th>"; 
echo "<th>二</th>"; 
echo "<th>三</th>"; 
echo "<th>四</th>"; 
echo "<th>五</th>"; 
echo "<th>六</th>"; 
echo "</tr>"; 
//开始铺表格 
for($i = 1 - $weeks;$i <= $days;){ 
echo "<tr>"; 
for ($j=0; $j < 7; $j++) {  
if ($i > $days || $i < 1) { 
echo "<td> </td>"; 
} else{ 
echo "<td>{$i}</td>"; 
} 
$i++; 
} 
echo "</tr>"; 
} 

echo "</table>"; 
//实现一下上一年和上一月 
if($month == 1){ 
$prevyear = $year - 1; 
$prevmonth = 12; 
} else{ 
$prevyear = $year; 
$prevmonth = $month -1; 
} 
if($month == 12){ 
$nextyear = $year + 1; 
$nextmonth = 1; 
}  else{ 
$nextyear = $year; 
$nextmonth = $month + 1; 
} 

//输出上一月和下一月的按钮 
echo "<h2><a href = 'index.php?y={$prevyear}&m={$prevmonth}'>上一月</a>|<a href='index.php?y={$nextyear}&m={$nextmonth}'>下一月</a></h2>"; 
echo "</center>"; 
?>