Strict warning: Only variables should be passed
2112
Strict warning: Only variables should be passed by reference
110433
Locally declared variables can not be inspected
4588
Put local variables for Block in a variable
71634
Can a variable be defined only in the scope of an if-statement, similar to how it's often done for for-loops?
142089
Stricter  usage rules
59378
Conditionally pass params to a script
97134
PHP conditionals, brackets needed?
6369
Is there a spec that the id of elements should be made global variable?
53586
How can I type-check variables in Python?
82845
How to defer variable expansion
137660
Avoid running the script if a variable is not defined
151963
How can I pass my locals and access the variables directly from another function?
57604
Set variable conditionally on command line
16454
Enforcing correct variable bindings and avoiding renamings for conflicting variables in nested scoping constructs
18550
Limit with multiple variables
109507
How to pass variables by reference and by value
40229
How do I check if a variable exists?