使用 substr 的 PHP 表单验证
[英]PHP form validation using substr
问题描述
I'm trying to make a program that accepts string even if it is misspelled as long as the first 2 letters is correct.
我正在尝试制作一个接受字符串的程序，即使它拼写错误，只要前 2 个字母是正确的。 Earlier when i run my program it works fine but when i put this早些时候当我运行我的程序时它工作正常但是当我把这个
if(substr($player1, 0, 2) === "rock" || substr($player2, 0, 2) === "rock")
then click submit it will not print anymore.然后单击提交它将不再打印。 What did i do wrong with my code?我的代码做错了什么？ or what function is supposed to be use?或者应该使用什么功能？
<html>
<body>
<h1>ROCK PAPER SCISSORS</h1>
<?php
print ('<form action="" method="post">');
print ('<p>Player 1: <input type="text" name="p1" /></p>');
print ('<p>Player 2: <input type="text" name="p2" /></p>');
print ('<input type="submit" name="submit" value="PLAY" />');
print ('</form>');
if (isset($_POST['submit'])) {
$player1score = 0;
$player2score = 0;
$draw = 0;
$player1 = strtolower($_POST['p1']);
$player2 = strtolower($_POST['p2']);
if(substr($player1, 0, 2) === "rock" || substr($player2, 0, 2) === "rock"){
if ($player1 == 'scissors' && $player2 == 'scissors') {
$draw++;
print "Player 1: $player1score<br>";
print "Player 2: $player2score<br>";
print "DRAW: $draw";
}
else if ($player1 == 'rock' && $player2 == 'rock') {
$draw++;
print "Player 1: $player1score<br>";
print "Player 2: $player2score<br>";
print "DRAW: $draw";
}
else if ($player1 == 'paper' && $player2 == 'paper') {
$draw++;
print "Player 1: $player1score<br>";
print "Player 2: $player2score<br>";
print "DRAW: $draw";
}
else if ($player1 =='rock' && $player2 =='scissors') {
$player1score++;
print "Player 1: $player1score<br>";
print "Player 2: $player2score<br>";
print "DRAW: $draw";
}
else if ($player1 == 'rock' && $player2 =='paper') {
$player2score++;
print "Player 1: $player1score<br>";
print "Player 2: $player2score<br>";
print "DRAW: $draw";
}
else if($player1 == 'scissors' && $player2 == 'rock') {
$player2score++;
print "Player 1: $player1score<br>";
print "Player 2: $player2score<br>";
print "DRAW: $draw";
}
else if ($player1 =='scissors' && $player2 =='paper') {
$player1score++;
print "Player 1: $player1score<br>";
print "Player 2: $player2score<br>";
print "DRAW: $draw";
}
else if ($player1 =='paper' && $player2 =='rock') {
$player1score++;
print "Player 1: $player1score<br>";
print "Player 2: $player2score<br>";
print "DRAW: $draw";
}
else if ($player1 =='paper' && $player2 == 'scissors') {
$player2score++;
print "Player 1: $player1score<br>";
print "Player 2: $player2score<br>";
print "DRAW: $draw";
}
}
}
?>
</html>
</body>
1 个解决方案
解决方案1
1 2015-09-16 14:53:53
The problem is in the string 'rock' , because the substr will only return 2 characters, not 4.问题出在字符串'rock' ，因为substr只会返回 2 个字符，而不是 4 个。
Here is what you should do:这是你应该做的：
// Checking for "rock", but only care about the beginning of "ro" ck
if(substr($player1, 0, 2) === "ro" || substr($player2, 0, 2) === "ro")
I hope that helps.我希望这有帮助。
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