...R>//双引号可以解析变量和转义字符 $username = "jack"; echo "his name is $username!"; echo ""; $username = "小东"; //如果是英文的感叹号会正常解析变量 echo "他的名字是$username!";//他的名字是小

... //读入数组 mysql_close($db) ; echo "-----------------------------共["; if ($q!="") { $page = $q; } else { $page = 0; }

... //读入数组 mysql_close($db) ; echo "-----------------------------共["; if ($q!="") { $page = $q; } else { $page = 0; }

...r、Float、Double、String、Boolean、Array、Object * */$sum = 10;echo $sum;$count = 2.5;echo $count;// 数据类型转换：隐式转换$sum = $count;echo $sum;echo

...下程序跑出来的结果

测试代码如下：

echo '1、测试空变量：';

$a ='';

if(isset($a)){

echo 'isset:true';

}else{

echo 'isset:false';

}

echo ' ';

if(!empty($a)){

echo '

... //读入数组

mysql_close($db) ;

echo "-----------------------------共[";

if ($q!="") {

$page = $q;

} else {

$page =

@echo off@title Oracle简易数据备份工具:startBackupDataclsecho.echo Oracle简易数据备份工具echo.set nowDate=%date:~0,4%%da

@echo off@title Oracle简易数据备份工具:st

...双引号可以解析变量和转义字符

$username = "jack";

echo "his name is $username!";

echo "
";

$username = "小东";

echo "";

echo "";

echo "";

echo "";

...

...le

3,检查安装环境，此处直接写成了一个小脚本echo "sem: ";echo "min 250 32000 100 128"; echo "is " `cat /proc/sys/kernel/sem`; echo; \echo "shmall: ";echo "min 2097152"