In PHP programming double quotes "and single quotes" is a string and character representation, then we want to output how it does it, let's look at a simple output single double quotes example.
Home we see several ways to output double quotes
Method one.
Copy Code code as follows:
$str = ' I want to output double quotes ';
Echo $str;
The result is: I want to output double quotes "
Method Two
Copy Code code as follows:
$STR = "Output double quotes \" ";
Echo $str;
Result output double quotes "
Output single and double quotes
Copy Code code as follows:
<?php
$STR = "Output single quotes '";
$str 1 = ' output single quotation mark \ ';
Echo $str;
?>
Single quotes in the middle of the literal variables do not execute, double quotes in the middle of the variable can be executed, so in the absence of variables, the use of single quotes to output character efficiency is much higher than double quotes.
For special characters, you can use the transfer character "\".
