Can we use PHP iF Statements in <<

Question

I am using <<<EOD to output some data. My question is how to use php if condition inside the <<<EOD syntax? can i use it like this

 <<<EOD
<h3>Caption</h3>
if(isset($variablename))
{
echo "...some text";
}
else
{
echo "...some text";
}
EOD;

possible duplicate of [conditional statements inside php heredocs syntax?](http://stackoverflow.com/questions/4012126/conditional-statements-inside-php-heredocs-syntax) — brasofilo, May 10 '13 at 01:58

Spudley · Accepted Answer · 2013-05-09T16:23:49.483

13

No, because everything inside the <<< block (known as a "HEREDOC") is a string.

If you write the code in the question, you'll be writing a string containing PHP code, which isn't what you want (I hope).

Do your logic outside of the HEREDOC, and use plain variables inside it:

if(isset($variablename)) {
   $outputVar = "...some text";
} else {
    $outputVar = "...some text";
}

print <<<EOD
<h3>Caption</h3>
{$outputVar}
EOD;

edited May 09 '13 at 16:23

answered May 09 '13 at 16:17

Spudley

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Then is there any way to to use if condition with << – Kiran Tangellapalli May 09 '13 at 16:18
@kumar - no there isn't. You would need to do the logic outside of the `<<<` block. – Spudley May 09 '13 at 16:19
1

The heredoc syntax does allow interpolation just like when using double quotes, so whatever is inside will not necessarily come out the same as it goes in. – G-Nugget May 09 '13 at 16:20
@DaveChen - don't know where you got that idea from. Using variables inside a `<<<` block is perfectly fine; it will work. (although not as you have it in your comment, as `<<<` blocks must be multi-line of course). – Spudley May 09 '13 at 16:21
Ok thanks for help... can we use like this if(isset($var)) { <<CAPTION } – Kiran Tangellapalli May 09 '13 at 16:21
Nevermind, was thinking of something else. – Dave Chen May 09 '13 at 16:22
i want that whole if statement to be in a variable. can we use like that? – Kiran Tangellapalli May 09 '13 at 16:23

score 9 · Answer 2 · edited May 23 '17 at 10:30

9

You can only use expressions, not statements, in double quoted strings.

There's a workaround in complex variable expressions however. Declare a utility function beforehand, and assign it to a variable.

$if = function($condition, $true, $false) { return $condition ? $true : $false; };

Then utilize it via:

echo <<<TEXT

   content

   {$if(isset($var), "yes", "no")}

TEXT;

edited May 23 '17 at 10:30

Community

1
1

answered May 09 '13 at 16:26

mario

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Just a note: this solution requires PHP >= 5.3 if you want to use an anonymous function and not a named function. – G-Nugget May 09 '13 at 16:28
The expression syntax works with all PHP versions. The anonymous function could be displaced with a named function and plain string in the `$if` variable for PHP before 5.3. (Which is a good idea, since 5.3 just recently reached 50% server spread.) – mario May 09 '13 at 16:30
can we use html table in << – Kiran Tangellapalli May 09 '13 at 16:34
@kumar: That's a different question, and can also easily be googled or evaluated by trying out. – mario May 09 '13 at 16:35
This is the correct answer. Tested and it works! Thank you :] – tfont Aug 11 '15 at 15:40

score 2 · Answer 3 · answered May 09 '13 at 16:18

2

No, but you can use variable substitions

if(isset($variablename))
{
$var "...some text";
}
else
{
$var "...some text";
}
<<<EOD
<h3>Caption</h3>
$var
EOD;

answered May 09 '13 at 16:18

Anigel

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G-Nugget · Answer 4 · 2013-05-09T16:25:21.243

1

No. Interpolation using the heredoc syntax is the same as when using double quotes. You can do simple interpolation of variables or class methods, but that's it.

This code

$foo = 'bar';
<<<EOD
$foo
baz($foo);
EOD;

will output

bar
baz(bar)

edited May 09 '13 at 16:25

answered May 09 '13 at 16:18

G-Nugget

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score 0 · Answer 5 · answered May 09 '13 at 16:17

0

<<<EOD
<h3>Caption</h3>
EOD;
if(isset($variablename))
{
echo "...some text";
}
else
{
echo "...some text";
}

answered May 09 '13 at 16:17

웃웃웃웃웃

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Can we use PHP iF Statements in <<

5 Answers5