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practice.php
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practice.php
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<html>
<title>practice</title>
<body>
<?php
$mess="";
if(isset($_POST["sub"])){
if($_POST["num1"]==""){
$mess .="The first blank cannot be empty!";
}else{
if(!isnumeric($_POST["num1"]))
$mess .="Please input the number!";
}
if($_POST["num2"]==""){
$mess .="The second blank cannot be empty!";
}else{
if(!is_numeric($_POST["num2"])){
$mess .="input the number";
}
else{
if($_POST["opt"]=="/"&&$_POST["num2"]==0)
$mess .="it cannot be zero";
}
}
}
?>
<table border=1 align="center" width="400" >
<form action="" method="post">
<caption><h1>calculator</h1></caption>
<tr>
<td>
<input type="text" size="4" name="num1" value="<?php echo @$_POST["num1"] ?>" />
</td>
<td>
<select name="opt">
<option value="+"<?php echo @$_POST["opt"]=="+"? "selected":"" ?>>+</option>
<option value="-"<?php echo @$_POST["opt"]=="-"? "selected":"" ?>>-</option>
<option value="*"<?php echo @$_POST["opt"]=="*"? "selected":"" ?>>*</option>
<option value="/"<?php echo @$_POST["opt"]=="/"? "selected":"" ?>>/</option>
</select>
</td>
<td>
<input type="text" size="4" name="num2" value="<?php echo @$_POST["num2"]?>"/>
</td>
<td>
<input type="submit" name="sub" value="get"/>
</td>
</tr>
</form>
<?php
if( isset($_POST["sub"])){
}
?>
<?php
$contact = array("ID"=>1,"name"=>"gao","company"=>"A");
echo '<dl>';
while(list($key,$value)=each($contact)){
echo "<dd> $key :$value </dd>";
}
echo '</dl>';
?>
<?php
function myFun($var){
if($var%2==0){
return true;
}
}
$cc=array("a"=>1,"b"=>2,"c">=3);
print_r(array_filter($cc,"myFun"));
?>
</body>
</html>