在 PHP 中转义引号
在编程中,在字符串中使用引号等特殊字符可能会导致错误。为了处理这个问题,PHP 提供了转义这些字符的方法,确保它们被视为字符串的一部分。
考虑以下代码:
$text1 = 'From time to "time" this submerged or latent theater in 'Hamlet'' becomes almost overt.';
此代码会引发解析错误,因为双引号字符串内的引号。为了转义它,使用反斜杠 ():
$text1 = 'From time to \"time\" this submerged or latent theater in 'Hamlet'' becomes almost overt.';
反斜杠指示 PHP 按字面解释以下字符,使引号成为字符串的一部分。
或者单引号可以使用,因为它们不需要转义特殊字符:
$text1 = 'From time to "time"';
当使用字符串中的变量时,双引号允许字符串插值:
$name = 'Chris'; $greeting = "Hello my name is $name"; // equals "Hello my name is Chris"
对于大文本块,可以使用此处文档:
$heredoc = <<<term This is a long line of text that include variables such as $someVar and additionally some other variable $someOtherVar. It also supports having 'single quotes' and "double quotes" without terminating the string itself. heredocs have additional functionality that most likely falls outside the scope of what you aim to accomplish. term;
了解这些转义引号和处理字符串中特殊字符的技术对于有效的 PHP 编程。
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