[英]str_replace in php
i have a long string that can hold all these values at the same time: 我有一个长字符串,可以同时保存所有这些值:
hello<!>how are you? <!>I am fine<!> What is up? <!> Nothing!
I need to find all these posibilities: 我需要找到所有这些可能性:
' <!> '
' <!>'
'<!> '
'<!>'
And replace them with "\\n" 并将其替换为“ \\ n”
Can that be achieved with str_replace in php? 可以在PHP中使用str_replace来实现吗?
If you only have those 4 possibilities, yes, then you can do that with str_replace
. 如果只有这4种可能性,那么可以使用
str_replace
做到这一点。
$str = str_replace( array( ' <!> ', ' <!>', '<!> ', '<!>' ), "\n", $str );
Yeah, but what if there is two spaces ?
是的,但是如果有两个空格怎么办? Or a tab ?
还是选项卡? Do you add a spacial case for each ?
您是否为每个案例都添加了一个空格?
You can either add special cases for each of those, or use regular expressions: 您可以为每种情况添加特殊情况,也可以使用正则表达式:
$str = preg_replace( '/\s*<!>\s*/', "\n", $str );
Of course, you can achieve this with 4 calls to str_replace
. 当然,您可以通过对
str_replace
4次调用来实现。 Edit: I was wrong. 编辑:我错了。 You can use arrays in
str_replace
. 您可以在
str_replace
使用数组。
$str = str_replace(' <!> ', "\n", $str);
$str = str_replace(' <!>', "\n", $str);
$str = str_replace('<!> ', "\n", $str);
$str = str_replace('<!>', "\n", $str);
Also consider using strtr
, that allows to do it in one step. 还可以考虑使用
strtr
,它允许一步完成。
$str = strtr($str, array(
' <!> ' => "\n",
' <!>' => "\n",
'<!> ' => "\n",
'<!>' => "\n"
));
Or you can use a regular expression 或者您可以使用正则表达式
$str = preg_replace('/ ?<!> ?/', "\n", $str);
You certainly can do it with str_replace like this: 您当然可以使用str_replace做到这一点:
$needles = array(" <!> ","<!> "," <!>","<!>");
$result = str_replace($needles,"\n",$text);
Edit: preg_replace('/\\s*<!>\\s*', PHP_EOL, $string);
编辑:
preg_replace('/\\s*<!>\\s*', PHP_EOL, $string);
should be better. 应该更好。
Sure, str_replace('<!>', "\\n", $string);
当然,
str_replace('<!>', "\\n", $string);
if your example is complete. 如果您的示例已完成。
You can't do that with just str_replace
. str_replace
不能做到这一点。 Either use a combination of explode
, strip
and implode
, or user preg_replace
. 可以结合使用
explode
, strip
和implode
,也可以使用用户preg_replace
。
You could use: 您可以使用:
//get lines in array
$lines = explode("<!>", $string);
//remove each lines' whitesapce
for(i=0; $i<sizeof($lines); $i++){
trim($lines[$i]);
}
//put it into one string
$string = implode("\n", $lines)
It's a bit tedious, but this should work (also removes two spaces, and tabs). 这有点乏味,但是应该可以(也删除两个空格和制表符)。 (didn't test the code, so there could be errors)
(未测试代码,因此可能存在错误)
This is kind of neat: 这很整洁:
$array = explode('<!>', $inputstring);
foreach($array as &$stringpart) {
$stringpart = trim($stringpart);
}
$outputstring = implode("\r\n", $array);
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