Answers for "php code php.com"

php .com

Regarding earlier note by @purkrt :

> I would like to stress out that the opening tag is "<?php[whitespace]", not just "<?php"

This is absolutely correct, but the wording may confuse some developers less familiar with the extent of the term "[whitespace]".

Whitespace, in this context, would be any character that generated vertical or horizontal space, including tabs ( t ), newlines ( n ), and carriage returns ( r ), as well as a space character ( s ). So reusing purkrt's example:

<?php/*blah*/ echo "a"?> 

would not work, as mentioned, but :

<?php /*php followed by space*/ echo "a"?>

will work, as well as :

<?php
/*php followed by end-of-line*/ echo "a"?>

and :

<?php    /*php followed by tab*/ echo "a"?>

I just wanted to clarify this to prevent anyone from misreading purkrt's note to mean that a the opening tag --even when being on its own line--required a space ( s ) character. The following would work but is not at all necessary or how the earlier comment should be interpreted :

<?php 
/*php followed by a space and end-of-line*/ echo "a"?>

The end-of-line character is whitespace, so it is all that you would need.

php .com

In php there are 3 types of comments
1.single line c++ style comment(//)
2.single line Unix shell stype comment(#)
3.multi line c style comment(/*/)

single or multi line comment comes to the end of the line or come first to the current block of php code.

HTML code will be printed after //...?> or #...?>
closing tag breaks the php mode and return to html mode.

different comments in different tags:
===================================
 <H1>Standard tag: <?php //echo " standard tag"; ?>single line c++ style comment</H1>
 <p>The header above will break php mode and return html mode and show  'Standard tag:single line c++ style comment'</p>

 <H1>Standard tag: <?php # echo " standard tag"; ?>single line unix shell style comment</H1>
 <p>The header above will break php mode and return html mode and show  'Standard tag:single line unix shell style comment'</p>

 <H1>Standard tag: <?php /*echo " standard tag"; */?>multi line c style comment</H1>
 <p>The header above will break php mode and return html mode and show  'Standard tag:multi line c style comment'</p>

  <H1>short echo tag: <?= // " short echo tag"; ?>single line c++ style comment</H1>
 <p>The header above will break php mode show a unexpected syntex error'</p>

  <H1>short echo tag: <?= #  " short echo tag"; ?>single line c++ style comment</H1>
 <p>The header above will break php mode show a unexpected syntex error'</p>

  <H1>short echo tag: <?= /*echo " short echo tag"*/ ; ?>multiple  line c style comment</H1>
 <p>The header above will break php mode show a unexpected syntex error'</p>

 <H1>Short tag: <? //echo " short tag";?>single line c++ style comment</H1>
 <p>The header above will break php mode and return html mode and show  'Short tag:single line c++ style comment'</p>

  <H1>Short tag: <? #echo " short tag";?>single line unix shell style comment</H1>
 <p>The header above will break php mode and return html mode and show  'Short tag:single line unix shell style comment'</p>

   <H1>Short tag: <? /* echo " short tag";*/?>multi line c style comment</H1>
 <p>The header above will break php mode and return html mode and show  'Short tag:multi line c style comment'</p>

    <H1>Script tag: <script language="php"> // echo " script tag";</script>single line c++ style comment</H1>
 <p>The header above will break php mode and return html mode and show  'Script tag:single line c++ style comment'</p>

    <H1>Script tag: <script language="php"> /* echo " script tag";*/</script>multi line c style comment</H1>
 <p>The header above will break php mode and return html mode and show  'Script tag:multi line c style comment'</p>

    <H1>Script tag: <script language="php"> # echo " script tag";</script>single line unix shell style comment</H1>
 <p>The header above will not break php mode </p>