The difference between $_get and $_post and single and double quotes in PHP for super-global array variables

The 1,$_get is displayed in the Address bar in clear text, $_post is through the HTTP main request, the page can not see (through Firebug);

2,http does not specify $_get and $_post can submit data restrictions, $_get by the browser and Web server settings, $_post is also affected by the Web server and php.ini related settings, $_get generally submit data size not exceeding 2k;

3, from the set up to $_get generally used to obtain or query data and carry out parameters, $_post generally used to update, insert, delete data and carry out parameters, with $_post to submit data relative to $_get security is higher;

4,$_post can submit a large amount of data, but it is not unlimited, can submit file data, $_get cannot submit file data.

A, the single quotation mark and the double quotation mark distinguish the escape character to be different, the single quotation mark can escape "\ ', \ \", and the double quotation mark can escape "\", \\,\r\n,\t,\f,\v,\$ ";

b, the single quotation mark cannot parse the variable, the double quotation mark can parse the variable, for example:

<?php

$a = 12;

$str 1= ' This is $a ';//print the result as this is $a

$str 2= "INSERT INTO Test set a= ' $a '"; \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ a= ' 12 '

C, the speed of resolution is different, single quotes faster

The difference between $_get and $_post and single and double quotes in PHP for super-global array variables