Why is <? used for and which is the difference with <?php
15994
Reference — What does this symbol mean in PHP?
32293
What's the difference between if(!$variable) and if(isset($variable))?
120580
What does "=>" mean in PHP?
66172
What's the difference between  and ,  and ?
97134
PHP conditionals, brackets needed?
99330
Why do you need $ when accessing array and hash elements in Perl?
34625
What is the difference between $* and $@?
140931
What is the difference between if(!!condition) and if(condition)
111655
What is the difference between single-quoted and double-quoted strings in PHP?
59623
Understanding PHP & (ampersand, bitwise and) operator
32886
What is the difference between != and =! in Java?
157148
What are the valid characters in PHP variable, method, class, etc names?
18722
Should I use $* or $@?
96938
What's the difference between using > and >> in shell?
25358
What is the differences between &> and 2>&1
130399
What is the difference between  and !=
126174
What is the difference between != and  operators?