当针字符串包含不可见/零宽度字符时，strpos() 返回 false
为什么回报不好？
<?php
$r = "<h3>Welcome</h3>";
if (strpos($r, "Welcome") !== FALSE) {
echo "Good";
}
?>
通过对创建此帖子时被破坏的违规 unicode 字符进行硬编码来重现：
$r = "<h3>Welcome</h3>";
if (strpos($r, "\u{200C}Welcome") !== FALSE) {
echo "Good";
}
Why it is not returning good?
<?php
$r = "<h3>Welcome</h3>";
if (strpos($r, "Welcome") !== FALSE) {
echo "Good";
}
?>
Reproduce by hardcoding the offending unicode character which was destroyed when creating this post:
$r = "<h3>Welcome</h3>";
if (strpos($r, "\u{200C}Welcome") !== FALSE) {
echo "Good";
}
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评论（3）
你看到那个小
框了吗？即 UTF-8 中的E2 80 8B，即零宽度空间。这并不存在于您的源文本中。
Do you see the little
box? That isE2 80 8Bin UTF-8, the zero-width space.And that's not present in your source text.
奇怪的是，它对我有用（请参阅 codepad）：
但是，我重写了该字符串，因为在您的代码中它包含一个隐藏字符。 ;)
Strange, it works for me (see codepad):
However, I rewrote the string because in your code it contains a hidden character. ;)
你的代码应该可以工作 - 逻辑很好。
然而，那里有一个有趣的角色 - 我想你已经从某个地方复制/粘贴了这段代码？
当我将此页面上的代码复制到编辑器中时，它抱怨有一个字符无法在我的字符集中表示，并且
strpos($r, " Welcome")变为strpos （$r，“？欢迎”）。输入字符串不会发生这种情况，因此它们不会匹配。
Your code should work - the logic is fine.
However, there is a funny character in there somewhere - I presume you have copy/pasted this code from somewhere?
When I copy the code off this page into my editor, it complains that there is a character that cannot be represented in my character set, and
strpos($r, "Welcome")becomesstrpos($r, "?Welcome").This does not happen for the input string so they won't match.