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PHP, the difference between single and double quotes ' "" "" "

Source: Internet
Author: User
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First, Escape

Single quotes: only escape \ ' and \ \, others not escaped

Double quotes: both escaped

Second, the variable analysis

Single quote: Cannot parse variable (output as-is)

Double quotes: You can parse variables

Third, speed

Single quotes: Faster

Double quotes: To analyze if there are variables, escape content more

Conclusion: The use of single quotation marks, the need to parse variables and the need to escape related characters when using double quotation marks.

PHP, the difference between single and double quotes ' "" "" "

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