ID: 14879
Updated by: jimw
Reported By: [EMAIL PROTECTED]
Status: Bogus
Bug Type: Scripting Engine problem
Operating System: Linux-Mandrake 8.1
PHP Version: 4.0.6
New Comment:
ereg_replace is behaving as designed, more or less. the behavior of an
empty first parameter is undefined (although with the bundled regular
expression engine, it will leave the string unchanged and display an
error message). i'd argue the behavior you're seeing is correct. it is
replacing the empty spaces in the strings with the replacement string.
(preg_replace() behaves this way.)
you are seeing the html tags unescaped because that is what some
browsers do with invalid-looking html tags (like you'll get with a pipe
between every character). php doesn't do any internal escaping of html
characters.
Previous Comments:
------------------------------------------------------------------------
[2002-01-05 19:01:19] [EMAIL PROTECTED]
No idea what your points are.
The first one gives a warning REG_EMPTY and the second does what it is
expected to do: replace all space characters with pipe symbols (tested
with 4.0.6 and 4.1.1).
And, really, separate code from description.
------------------------------------------------------------------------
[2002-01-05 18:35:56] [EMAIL PROTECTED]
<?
## Assign a bit of HTML to two source variables
#
$space_source_text =
$null_source_text = "<b>PHP</b> <i>is</i> a useful <u>tool</u>";
## Replace a substring within the the source variables
# with another substring
$null_source_text = ereg_replace("", "|" $null_source_text);
$space_source_text = ereg_replace(" ", "|", $space_source_text);
## Print the new values of the source variables
#
print("This is the result of calling ereg_replace with an empty
parameter.<hr>$null_source_text<br><br><br>");
print("This is the result of calling ereg_replace with a space as the
value of the parameter.<hr>$space_source_text");
## Conclusion
#
# To me it seems that there are two significant points to make about the
behaviour of ereg_replace as demonstrated
# in this example.
#
# The first point is that, when passing an empty value in the first
parameter, the ereg_replace function inserts
# the second parameter between every character in the string, therefor
increasing the overall size of the string.
# It is inserting -- not replacing as the function name implies
#
# The second point is that, when passing an empty value in the first
parameter, the ereg_replace function does
# not evaluate the HTML tags so that they are correctly rendered to the
browser.
#
# Please keep in mind that I have yet to see the definition of
ereg_replace.
#
# At first, I thought the ereg_replace function was possibly checking to
see if the first parameter was empty, and if
# so, return execution immediatly to the caller. However, this doesn't
appear to be the case because it is obviously
# transversing the character array because it is inserting the second
parameter between each character.
#
# I'm guessing that PHP does some internal escaping of HTML characters
and the empty first parameter is somehow
# goofing up the translation back to clean HTML
#
##
?>
------------------------------------------------------------------------
[2002-01-05 18:33:02] [EMAIL PROTECTED]
<?
## Assign a bit of HTML to two source variables
#
$space_source_text =
$null_source_text = "<b>PHP</b> <i>is</i> a useful <u>tool</u>";
## Replace a substring within the the source variables
# with another substring
$null_source_text = ereg_replace("", "|",
$null_source_text);
$space_source_text = ereg_replace(" ", "|",
$space_source_text);
## Print the new values of the source variables
#
print("This is the result of calling ereg_replace with an empty
parameter.<hr>$null_source_text<br><br><br>");
print("This is the result of calling ereg_replace with a space as the
value of the parameter.<hr>$space_source_text");
## Conclusion
#
# To me it seems that there are two significant points to make about
the behaviour of ereg_replace as demonstrated
# in this example.
#
# The first point is that, when passing an empty value in the first
parameter, the ereg_replace function inserts
# the second parameter between every character in the string, therefor
increasing the overall size of the string.
# It is inserting -- not replacing as the function name implies
#
# The second point is that, when passing an empty value in the first
parameter, the ereg_replace function does
# not evaluate the HTML tags so that they are correctly rendered to the
browser.
#
# Please keep in mind that I have yet to see the definition of
ereg_replace.
#
# At first, I thought the ereg_replace function was possibly checking
to see if the first parameter was empty, and if
# so, return execution immediatly to the caller. However, this doesn't
appear to be the case because it is obviously
# transversing the character array because it is inserting the second
parameter between each character.
#
# I'm guessing that PHP does some internal escaping of HTML characters
and the empty first parameter is somehow
# goofing up the translation back to clean HTML
#
##
?>
------------------------------------------------------------------------
Edit this bug report at http://bugs.php.net/?id=14879&edit=1
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