PHP - 检测字符串之间的空格
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PHP - detect whitespace between strings
提问by hobodave
How would I go about detecting whitespace within a string? For example, I have a name string like:
我将如何检测字符串中的空格？例如，我有一个名称字符串，如：
"Jane Doe"
“简·多”
Keep in mind that I don't want to trim or replace it, just detect if whitespace exists between the first and second string.
请记住，我不想修剪或替换它，只需检测第一个和第二个字符串之间是否存在空格。
回答by hobodave
Use preg_match as suggested by Josh:
按照 Josh 的建议使用 preg_match：
<?php
$foo = "Dave Smith";
$bar = "SamSpade";
$baz = "Dave\t\t\tSmith";
var_dump(preg_match('/\s/',$foo));
var_dump(preg_match('/\s/',$bar));
var_dump(preg_match('/\s/',$baz));
Ouputs:
输出：
int(1)
int(0)
int(1)
回答by Tyler Carter
You could check for only alphanumerical characters, which whitespace is not. You could also do a strpos for a space.
您只能检查字母数字字符，而空白则不是。你也可以为一个空间做一个 strpos 。
if(strpos($string, " ") !== false)
{
// error
}
回答by Josh
Wouldn't preg_match("/\s/",$string)work? The advantage to this over strpos is that it will detect any whitespace, not just spaces.
不会的preg_match（ “/ \ s /”，$弦）工作？与 strpos 相比，它的优势在于它会检测任何空格，而不仅仅是空格。
回答by gurjeet kj
You may use something like this:
你可以使用这样的东西：
if (strpos($r, ' ') > 0) {
echo 'A white space exists between the string';
}
else
{
echo 'There is no white space in the string';
}
This will detect a space, but not any other kind of whitespace.
这将检测一个空格，但不会检测任何其他类型的空格。
回答by ThoKra
<?php
if(strpos('Jane Doe', ' ') > 0)
echo 'Including space';
else
echo 'Without space';
?>
回答by Rachel
// returns no. of matches if $str has nothing but alphabets,digits and spaces.
function is_alnumspace($str){
return preg_match('/^[a-z0-9 ]+$/i',$str);
}
回答by Interesting Articles
// returns no. of matches if $str has nothing but alphabets,digits and spaces. function
is_alnumspace($str) {
return preg_match('/^[A-Za-z0-9 ]+$/i',$str);
}
// This variation allows uppercase and lowercase letters.
