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问题描述
<?php // true var_dump('\\'==='\'); // false var_dump('\\\\\''==='\\'); // true var_dump('\\\\''==='\\\');
解决方案
\ 引入了几种类型的转义序列, \\ 是文字\的转义序列。但是,不能解析为转义序列的 \ s也被视为文字\。
Forfor,'\\'代表字符串\,'\\\\' code>代表字符串\\,就像'\\\\'一样。尝试:
echo'\\\\' - > \\请参阅 php/manual/en/language.types.string.php#language.types.string.syntax.single 。
Can anyone tell me what is happening here?
<?php // true var_dump('\\ ' === '\ '); // false var_dump('\\\\ ' === '\\ '); // true var_dump('\\\\ ' === '\\\ ');解决方案
\ inside a string literal introduces several types of escape sequences, \\ is the escape sequence for a literal "\". But, \s that don't resolve to an escape sequence are also taken as literal "\".
Therefor, '\\ ' stands for the string "\ ", '\\\\ ' stands for the string "\\ ", just as '\\\ '. Try:
echo '\\\\ '; -> \\See php/manual/en/language.types.string.php#language.types.string.syntax.single.
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字符串中的PHP和反斜杠
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