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Case Sensitivity (Perl and PHP Cross Reference Guide)

By Mike Prestwood

Perl versus PHP: A side by side comparison between Perl and PHP.

 
Language Basics
 

Language basics is kind of a catch all for absolute beginner stuff. The items (common names) I chose for language basics is a bit random and include items like case sensitivity, commenting, declaring variables, etc.

Case Sensitivity

[Other Languages] 

Languages Focus

Case sensitiviy in this case is referring to commands and variable names. For example, are "printf" and "PrintF" equivalent? Are fullname and FullName equivalent? When you create commands, operations, methods, or variables should you worry about case?

Perl:   Yes

Perl is case sensitive.

Syntax Example:
print "hello"; //This works.
Print "hello"; //This does not.
PHP:   Yes and No

PHP is case sensitive with variable names but not with commands. Although commands are case incenstive, I prefer to use all lowercase because it's easy to type and that's what I see most PHP coders doing and I see it on PHP.Net.

Syntax Example:

All of the following are equivalent:

echo "hello<br>";
ECHO "hello<br>";
Echo "hello<br>";
eCHo "hello<br>";

...but variables are case sensitive:

$fullname = "Mike Prestwood"; //These are two...
$FullName = "Wes Peterson";   //separate varialbes.












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