Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
571 views
in Technique[技术] by (71.8m points)

syntax - Are PHP keywords case-sensitive?

For example, is the following program meaningful, and if so what should it print?

<?php
FuncTIon fOo($x) { eChO $x; }
FOO('bar');
IF (TRuE) { echO 'qux'; }
?>

My interpreter runs it and prints barqux, implying the keywords are not case-sensitive:

$ php case_sensitive_keywords.php 
barqux
$ php --version
PHP 5.5.7-1+sury.org~precise+1 (cli) (built: Dec 12 2013 21:37:40) 

However, this same question was asked last year, and the answers say that keywords are case-sensitive, in direct contradiction to what my PHP interpreter appears to tell me!

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Case sensitive (both user defined and PHP defined)

  • variables
  • constants
  • array keys
  • class properties
  • class constants

Case insensitive (both user defined and PHP defined)

  • functions
  • class constructors
  • class methods
  • keywords and constructs (if, else, null, foreach, echo etc.)

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...