在 PHP 中轉義引號
在程式設計中,在字串中使用引號等特殊字元可能會導致錯誤。為了處理這個問題,PHP 提供了轉義這些字元的方法,確保它們被視為字串的一部分。
考慮以下程式碼:
$text1 = 'From time to "time" this submerged or latent theater in 'Hamlet'' becomes almost overt.';
此程式碼會引發解析錯誤,因為雙引號字串內的引號。為了轉義它,使用反斜線 ():
$text1 = 'From time to \"time\" this submerged or latent theater in 'Hamlet'' becomes almost overt.';
反斜線指示 PHP 按字面解釋以下字符,使引號成為字串的一部分。
或單引號可以使用,因為它們不需要轉義特殊字元:
$text1 = 'From time to "time"';
當使用字串中的變數時,雙引號允許字串插值:
$name = 'Chris'; $greeting = "Hello my name is $name"; // equals "Hello my name is Chris"
對於大文本區塊,可以使用此處文件:
$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;
了解這些轉義引號和處理字串中特殊字元的技術對於有效的PHP 程式設計。
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