'strlen' of a constant string Post: 302224544

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Top Forums Programming 'strlen' of a constant string Post 302224544 by cleopard on Wednesday 13th of August 2008 11:31:00 AM

08-13-2008

Registered User

'strlen' of a constant string

In a declaration, I have:

const char comment_begin[] = "";

const int comment_begin_len = strlen(comment_begin);
const int comment_end_len = strlen(comment_end);

When I compile, I get the warnings:

emhttpc.c:64: warning: initializer element is not constant
emhttpc.c:64: warning: (near initialization for �comment_begin_len')
emhttpc.c:65: warning: initializer element is not constant
emhttpc.c:65: warning: (near initialization for �comment_end_len')

Taking the 'const' doesn't make any difference. I could use 'sizeof', but it gives one greater than the length (is it counting a null terminator?). I'm not sure why it says it's not constant as I'm doing a strlen on a pair of constant strings, so their length can't change.

cleopard

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LEARN ABOUT PHP

strlen

STRLEN(3)								 1								 STRLEN(3)

strlen - Get string length

SYNOPSIS

       int strlen (string  $string)

DESCRIPTION

	Returns the length of the given $string.

PARAMETERS

	      o $string
		- The string being measured for length.

RETURN VALUES

	The length of the $string on success, and 0 if the $string is empty.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  Prior  versions  treated  arrays  as  the string |
       |	| Array, thus returning a string length  of  5	and |
       |	| emitting an E_NOTICE level error.		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      A strlen(3) example

	      <?php
	      $str = 'abcdef';
	      echo strlen($str); // 6

	      $str = ' ab cd ';
	      echo strlen($str); // 7
	      ?>

NOTES

       Note

	      strlen(3) returns the number of bytes rather than the number of characters in a string.

       Note

	      strlen(3) returns NULL when executed on arrays, and an E_WARNING level error is emitted.

SEE ALSO

       count(3), grapheme_strlen(3), iconv_strlen(3), mb_strlen(3).

PHP Documentation Group 														 STRLEN(3)