<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
</head>
<body>
<?php
$a=10;
$b=-3;
$c=2;
echo" \$a =".$a."<br>";
echo" \$b =".$b."<br>";
echo" \$c =".$c."<br>";
echo" \$a +\$b=".($a+$b)."<br>";
echo" \$a -\$b=".($a-$b)."<br>";
echo" \$a *\$b=".($a*$b)."<br>";
echo" \$a /\$b=".($a/$b)."<br>";
echo" \$a %\$b=".($a%$b)."<br>";
?>
</body>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
</head>
<body>
<?php
$a=10;
$b=-3;
$c=2;
echo" \$a =".$a."<br>";
echo" \$b =".$b."<br>";
echo" \$c =".$c."<br>";
echo" \$a +\$b=".($a+$b)."<br>";
echo" \$a -\$b=".($a-$b)."<br>";
echo" \$a *\$b=".($a*$b)."<br>";
echo" \$a /\$b=".($a/$b)."<br>";
echo" \$a %\$b=".($a%$b)."<br>";
?>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
</head>
<body>
<?php
$n="3.5e";
$m=11;
$nm=$n.$m;
echo $nm."\t";
$mn=$n+$m;
echo $nm;
?>
</body>
</html>
我的php5.5.13版本里面對於字符串的+和.都是連接兩個字符串的意思
