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Top Forums Shell Programming and Scripting Shell quoting rules for other languages programmers Post 302717339 by wyderkat on Thursday 18th of October 2012 04:13:27 AM
Old 10-18-2012
You are right, globbing is not expanded in any quoting. And single quotes
suppose to be faster than double quotes. But is it big difference
in performance?

Before I've investigated that problem I was thinking that eval is for odd
situation, like you. But now it looks to me like we should use it quite often!
For example, can anybody tell me how to do last line without eval:

USER_A=tom
USER_B=geoff
USER_C=anna
CURRENT='$USER_B' # without single quotes it would be just value copy
eval echo $CURRENT
 

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GET_MAGIC_QUOTES_GPC(3) 						 1						   GET_MAGIC_QUOTES_GPC(3)

get_magic_quotes_gpc - Gets the current configuration setting of magic_quotes_gpc

SYNOPSIS
bool get_magic_quotes_gpc (void ) DESCRIPTION
Returns the current configuration setting of magic_quotes_gpc Keep in mind that attempting to set magic_quotes_gpc at runtime will not work. For more information about magic_quotes, see this security section. RETURN VALUES
Returns 0 if magic_quotes_gpc is off, 1 otherwise. Or always returns FALSE as of PHP 5.4.0. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.4.0 | | | | | | | Always returns FALSE because the magic quotes | | | feature was removed from PHP. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 get_magic_quotes_gpc(3) example <?php // If magic quotes are enabled echo $_POST['lastname']; // O'reilly echo addslashes($_POST['lastname']); // O\'reilly // Usage across all PHP versions if (get_magic_quotes_gpc()) { $lastname = stripslashes($_POST['lastname']); } else { $lastname = $_POST['lastname']; } // If using MySQL $lastname = mysql_real_escape_string($lastname); echo $lastname; // O'reilly $sql = "INSERT INTO lastnames (lastname) VALUES ('$lastname')"; ?> NOTES
Note If the directive magic_quotes_sybase is ON it will completely override magic_quotes_gpc. So even when get_magic_quotes_gpc(3) returns TRUE neither double quotes, backslashes or NUL's will be escaped. Only single quotes will be escaped. In this case they'll look like: '' SEE ALSO
addslashes(3), stripslashes(3), get_magic_quotes_runtime(3), ini_get(3). PHP Documentation Group GET_MAGIC_QUOTES_GPC(3)
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