What is the difference between double quotes and single quotes in php

The difference between double quotes and single quotes in php is: the fields in double quotes will be parsed by the compiler and then output as HTML code; the fields in single quotes will not be parsed by the compiler, but will be output directly. .

The difference is as follows:

""The fields inside the double quotes will be parsed by the compiler, and then the HTML code will be output.

''The fields enclosed in single quotes are not parsed and are output directly.

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Note: Single quotation marks run faster than double quotation marks.

Code sample:

$a = '123';
echon $a    //结果是:123
echon '$a'    //结果是:$a
echon "$a"    //结果是:123

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