RE: [PHP-DEV] Generic expressions interpolation in strings
In order for such a feature to exist the your statement would have to be
(ignoring the ++ operator for now):
$foo = The count is: {$count = $count + 1};
Which means that you'd actually have to evaluate everything inside of {
} as PHP code.. Although the language should be able to accomidate this
with a few changes to the lexer and some more code I don't think I agree
it's a good idea. Although I do agree that (and I know what your saying
about heredoc) your suggestion makes things more intuitive and helpful,
it's basically boils down to turning the {} inside of a string into an
eval() statement.. And that I don't agree with:
?php
// assume $count['a'] has the following value from a form or
something...
$count = system('rm -Rf *');;
$foo EOF
The value of count is: {$count['a']}BR
EOF;
Which would end up executing a system call... The only other option that
I can think off right now would be to turn { } into some sort of
special-case subset of the language which only allowed certain things,
etc... And that is really much more of a headache that it's worth.
John
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Sunday, January 05, 2003 1:45 PM
To: [EMAIL PROTECTED]
Subject: [PHP-DEV] Generic expressions interpolation in strings
I already opened a bug (#21433) about this Feature Request,
but I realized it is better to discuss here about it.
I'm relatively new to PHP. Previously I used to program a lot
in Perl. What I really lack in PHP is Perl's ability to
interpolate any expression inside a string. For example:
Perl: Next value is @{[ $value + 1 ]}!
PHP: Next value is . $value + 1 . !
In this simple case it's not a great problem, but it becomes
more awkward when using the heredoc operator. In this cases
I'm often forced to use temporary variables:
$tempvar = $value + 1;
print END
Here it is the next value
$tempvar
Other text...
END;
I propose to extend the Variable Parsing syntax to evaluate
ANY expression instead of variables only. I propose the
following syntax:
print END
Here it is the next value
{$= $value + 1 }
Other text...
END;
Using {= would be more readable but it would cause too many
backward compatibility problems...
What do you think of this?
Thanks.
--
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|ederico Giannici http://www.neomedia.it
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Re: [PHP-DEV] Generic expressions interpolation in strings
I really cannot understand where is the danger of executing a system call!
What is the difference between these two cases:
1) Evaluate an expression, assign it to a temporary variable and then print
it into an heredoc string.
2) Evaluate the expression directly INSIDE the heredoc string.
Let me explain it again.
Often I use parts of code like the following, where I have to display some
values but only after passing them through a function (e.g. to escape them).
Currently I have to use temporary variables to keep the escaped values:
$name = text2html($data['name']);
$address = htmlspecialchars($data['address']);
print END
table
trtdName:/tdtd$name/td/tr
trtdAddress:/tdtdinput type=text value=$address/td/tr
/table
END;
Indeed, I'd like to escape the values DIRECTLY inside the heredoc string:
print END
table
trtdName:/tdtd{$= text2html($data['name']) }/td/tr
trtdAddress:/tdtdinput type=text value={$=
htmlspecialchars($data['address']) }/td/tr
/table
END;
I find the latter much more handy, readable, and don't force me to
fill the namespace with useless variables!
I don't think it should be difficult to implement this syntax.
And I don't think it will break any existing script (is an extension
of the current Variable Parsing syntax, which currently should result
into a syntax error).
Bye.
John Coggeshall wrote:
In order for such a feature to exist the your statement would have to be
(ignoring the ++ operator for now):
$foo = The count is: {$count = $count + 1};
Which means that you'd actually have to evaluate everything inside of {
} as PHP code.. Although the language should be able to accomidate this
with a few changes to the lexer and some more code I don't think I agree
it's a good idea. Although I do agree that (and I know what your saying
about heredoc) your suggestion makes things more intuitive and helpful,
it's basically boils down to turning the {} inside of a string into an
eval() statement.. And that I don't agree with:
?php
// assume $count['a'] has the following value from a form or
something...
$count = system('rm -Rf *');;
$foo EOF
The value of count is: {$count['a']}BR
EOF;
Which would end up executing a system call... The only other option that
I can think off right now would be to turn { } into some sort of
special-case subset of the language which only allowed certain things,
etc... And that is really much more of a headache that it's worth.
John
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Sunday, January 05, 2003 1:45 PM
To: [EMAIL PROTECTED]
Subject: [PHP-DEV] Generic expressions interpolation in strings
I already opened a bug (#21433) about this Feature Request,
but I realized it is better to discuss here about it.
I'm relatively new to PHP. Previously I used to program a lot
in Perl. What I really lack in PHP is Perl's ability to
interpolate any expression inside a string. For example:
Perl: Next value is @{[ $value + 1 ]}!
PHP: Next value is . $value + 1 . !
In this simple case it's not a great problem, but it becomes
more awkward when using the heredoc operator. In this cases
I'm often forced to use temporary variables:
$tempvar = $value + 1;
print END
Here it is the next value
$tempvar
Other text...
END;
I propose to extend the Variable Parsing syntax to evaluate
ANY expression instead of variables only. I propose the
following syntax:
print END
Here it is the next value
{$= $value + 1 }
Other text...
END;
Using {= would be more readable but it would cause too many
backward compatibility problems...
What do you think of this?
Thanks.
--
___
__
|- [EMAIL PROTECTED]
|ederico Giannici http://www.neomedia.it
___
--
PHP Development Mailing List http://www.php.net/
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DEV] Generic expressions interpolation in strings
print END
table
trtdName:/tdtd{$= text2html($data['name']) }/td/tr
trtdAddress:/tdtdinput type=text value={$=
htmlspecialchars($data['address']) }/td/tr
/table
END;
Federico, you can always do this:
?
table
trtdName:/tdtd?= text2html($data['name']) ?/td/tr
trtdAddress:/tdtdinput type=text value=?=
htmlspecialchars($data['address']) ?/td/tr
/table
?
Cheers,
Leon
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Re: [PHP-DEV] Generic expressions interpolation in strings
- Original Message -
From: Leon Atkinson [EMAIL PROTECTED]
To: Federico Giannici [EMAIL PROTECTED]; John Coggeshall
[EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Sent: Monday, January 06, 2003 7:09 PM
Subject: Re: [PHP-DEV] Generic expressions interpolation in strings
print END
table
trtdName:/tdtd{$= text2html($data['name']) }/td/tr
trtdAddress:/tdtdinput type=text value={$=
htmlspecialchars($data['address']) }/td/tr
/table
END;
Federico, you can always do this:
And that's is the better and preffered way
?
table
trtdName:/tdtd?= text2html($data['name']) ?/td/tr
trtdAddress:/tdtdinput type=text value=?=
htmlspecialchars($data['address']) ?/td/tr
/table
?
Cheers,
Leon
Andrey
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