Beispielcode-Sharing für die Implementierung einiger kleiner Dinge in PHP

$q = "SELECT CONVERT(TEXT, userinfo.inv) as te FROM userinfo where  (1=1)";

$shijianchuo = strtotime("$logintime");
$past_logintime = date("Y/m/d",$shijianchuo-24*60*60);
$today_time=date("Y-m-d");
$zh_time = strtotime("$today_time");
$yesterday_time= date("Y-m-d ",strtotime("-1 day","$zh_time")) ;
$tomorrow_time= date("Y-m-d ",strtotime("+1 day","$zh_time")) ;

<script language="javascript">
    function check(form){
        if(form.txt_user.value==""){
            alert("请输入用户名");form.txt_user.focus();return false;       
        }
        if(form.txt_pwd.value==""){
            alert("请输入密码");form.txt_pwd.focus();return false;
        }
    }
</script>

$filecount=0;
$dircount=0;
function copydir($dirFrom,$dirTO)
{
    global $filecount;
    global $dircount;
 
    if(is_file($dirTO))
    {
        die("目标不是目录，无法创建目录 $dirTO");
    }
 
    if(!file_exists(dirTO))
    {
        mkdir($dirTO);
        $dircount++;
    }
     
    $handle=opendir($dirFrom);
     
    while(($file=readdir($handle))!==false)
    {
        if($file !="." && $file !="..")
        {
            $fileFrom=$dirFrom.DIRECTORY_SEPARATOR.$file;
            $fileTo=$dirTO.DIRECTORY_SEPARATOR.$file;
             
            if(is_dir($fileFrom))
            {
                copydir($fileFrom,$fileTo);
            }else{
                copy($fileFrom,$fileTo);
                $filecount++;
            }          
        }
    }
    closedir($handle);
 
}
 
copydir(mail,mailbak);
echo "共拷贝".$filecount."文件，共拷贝目录".$dircount."个";

<?php
//将获取当前时间的代码放在一个函数里
function runtime(){
      $times = explode(" ",microtime());
      $nowtime = $times[1]+$times[0];
      return $nowtime;
}
 
//假设这里是页面开头
$start_time = runtime();
 
//这里开始是的页面代码
//your code goes here
 
//假设这里是页面顶部
$end_time = runtime();
$cost_time = $end_time - $start_time;
 
//处理输出执行时间
$cost_time = round($cost_time,4);
 
//输出页面的执行时间
echo "页面执行时间为：".$cost_time."秒";
?>

<?php
/**
* 方法:isdate()
* 功能:判断日期格式是否正确
* 参数:$str 日期字符串 $format日期格式
* 返回:布尔值
*/
function isdate($str,$format="Y-m-d"){
$strArr = explode("-",$str);
if(empty($strArr)){
return false;
}
foreach($strArr as $val){
if(strlen($val)<2){
$val="0".$val;
}
$newArr[]=$val;
}
$str =implode("-",$newArr);
    $unixTime=strtotime($str);
    $checkDate= date($format,$unixTime);
    if($checkDate==$str)
        return true;
    else
        return false;
}
//实例
if(isdate("2010-1-1")){
echo "true";
}else{
echo "false";
}

<?php
 
$filecount=0;
$dircount=0;
 
 
$file="mail";
 
function deleteDir($pathName)
{  
    global $filecount;
    global $dircount;
 
    if(file_exists($pathName))
    {
        if($handle=opendir($pathName))
        {
            while(($file=readdir($handle)) !==false)
                {  
                    if($file !="." && $file !="..")
                    {
                        $file=$pathName.DIRECTORY_SEPARATOR.$file;
                        if( is_dir($file))
                        {  
                            deleteDir($file);
                        }else{
                            if(unlink($file))
                            {  
                                $filecount++;
                                echo "文件<b> $file</b>删除成功<br>";
                            }else{
                                echo "文件<b> $file</b>删除失败<br>";
                            }
                        }
                    }
                }
            }
        closedir($handle); 
        if(rmdir($pathName))
        {  
            $dircount++;
            echo "目录<b> $pathName</b>删除成功<br>";
        }else{
            echo "目录<b> $pathName</b>删除失败<br>";
        }
    }
}
deleteDir($file);
echo "共删除".$filecount."文件，共删除目录".$dircount."个";
?>