' : apostrophe
":Double quotes
1. When using single quotes output text, all of the contents of quotation is considered text,
EG:
$ FACE = "Interview Technology";
Echo ' $ face / n 9CBS blog ';
?>
// The code that prints to the page will be complete:
$ face / n
PS: This time, the variable $ FACE will only be directly output, instead of replacing the related value "interview technology", while escape the character "/ n" wrap, it will be directly output, not converted into target characters.
2. When using double quotes output text,
EG:
$ FACE = "Interview Technology";
Echo " $ face / n 9cbs blog ";
?>
// The code that prints to the page will be like this:
PS: Here we can see that when double quotes, the variable $ FACE is replaced with the variable "interview technology" when printing to the screen, and the "/ n" wrap symbol is also converted into a wrap. But this At the time, the double quotation number of the tag value in HTML is sensitive, so you can use / ", or you can use single quotes to replace the double quotes of the tag value in HTML, thus avoid symbol sensitive.
3. Looking at the difference between single-double quotes in the PHP page output, we can make reasonable all-in-one single quotes, when you use double quotes. Through your writing programs more efficient.
