if（mb_strlen（）！=＃）的问题
[英]Issue with if (mb_strlen() != #)
问题描述
这可能真的很脏而且凌乱，所以任何输入也将有所帮助，但是我的主要问题是，如果字符串是正确的字符数（10或10，则不能获得“ ISBN”输入） 13）。 我不确定哪里出了问题。 在第64行。
请帮忙！ 谢谢。
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Link Generator</title>
</head>
<body>
<?php
function showForm() {
if (empty($_POST['title'])) {
$title = "Book Title";
} else {
$title = $_POST['title'];
}
?>
<form action="<?php $_SERVER['PHP_SELF'] ?>" method="post">
Search by ISBN<br />
<input type="text" maxlength="13" name="ISBN" size="30" value="ISBN" onblur="if(this.value == '') { this.value='ISBN'}" onfocus="if (this.value == 'ISBN') {this.value=''}" /><br />
<br />OR<br /><br />
Search by Title <strong>and</strong> Author<br />
<input type="text" maxlength="13" name="title" size="30" value="<?php echo $title; ?>" onblur="if(this.value == '') { this.value='Book Title'}" onfocus="if (this.value == 'Book Title') {this.value=''}" /><br />
<input type="text" maxlength="13" name="aname" size="30" value="Author Name" onblur="if(this.value == '') { this.value='Author Name'}" onfocus="if (this.value == 'Author Name') {this.value=''}" /><br />
<br /><input type="submit" name="submit" value="Generate Link" />
</form>
<?php
}
function generateLink_ISBN() {
echo "Your link has been generated:<br />";
echo "http://xxx.com/uhtbin/cgisirsi.exe/x/0/0/5?search_type=search&searchdata1=" . $_POST['ISBN'] . "&library=ALL&sort_by=PBYR";
}
function generateLink_title() {
echo "Your link has been generated:<br />";
echo "http://xxx.com/uhtbin/cgisirsi.exe/x/0/0/5?search_type=search&searchdata1=" . $_POST['title'] . "+" . $_POST['aname'] . "&library=ALL&sort_by=PBYR";
}
if(isset($_POST['submit'])) {
if (isset($_POST['ISBN']) && isset($_POST['title']) && isset($_POST['aname']) && ($_POST['ISBN'] == 'ISBN') && ($_POST['aname'] == 'Author Name') && ($_POST['title'] == 'Book Title')) {
echo "<h1>You did not input any information</h1>";
showForm();
} elseif (isset($_POST['ISBN']) && ($_POST['ISBN'] != 'ISBN')) {
if (isset($_POST['ISBN']) && ($_POST['ISBN'] != 'ISBN') && (!is_numeric ($_POST['ISBN']))) {
echo "<h1>The ISBN you entered did not contain all numerics</h1>";
showForm();
} elseif (isset($_POST['ISBN']) && ($_POST['ISBN'] != 'ISBN') && ((mb_strlen($_POST['ISBN'], 'utf-8') != 13) | (mb_strlen($_POST['ISBN'], 'utf-8') != 10))) {
echo "<h1>The ISBN you entered was too long or too short. ISBN's are 10 or 13 numbers in length.</h1>";
showForm();
} else {
generateLink_ISBN();
}
} elseif (isset($_POST['title']) && isset($_POST['aname']) && ($_POST['aname'] != 'Author Name') | ($_POST['title'] != 'Book Title')) {
if (isset($_POST['title']) && isset($_POST['aname']) && ($_POST['title'] == 'Book Title') && ($_POST['aname'] != 'Author Name')) {
echo "<h1>To search by author's name, you must also include the book title.</h1>";
showForm();
} elseif (isset($_POST['title']) && isset($_POST['aname']) && ($_POST['aname'] == 'Author Name') && ($_POST['title'] != 'Book Title')) {
echo "<h1>To search by book title, you must also include the author's name.</h1>";
showForm();
} else {
generateLink_title();
}
} else {
showForm();
}
} else {
showForm();
}
?>
</body>
1 个解决方案
解决方案1
2 已采纳 2012-02-23 21:47:41
这总是评估为true：
((mb_strlen($_POST['ISBN'], 'utf-8') != 13) | (mb_strlen($_POST['ISBN'], 'utf-8') != 10))
您是说“如果ISBN的长度不超过13个字符或ISBN的长度不超过10个字符，则为true”。 但是任何字符串都不能同时是13个字符和10个字符。
尝试以下方法：
!((mb_strlen($_POST['ISBN'], 'utf-8') == 13) | (mb_strlen($_POST['ISBN'], 'utf-8') == 10))
这将是“如果不是ISBN是13个字符或ISBN是10个字符的情况，则为true”。
mb_strlen（）就够了吗？
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