php stdin from bash pipe and heredoc

Question

Can I receive input from both a pipe, and a heredoc, and use them both from within php on the command line.

I want to do something like this:

bash$ ls -l | php <<'code'
<?php
   echo $piped;
?>
code

Which should return the result of ls -l

Also, can I use php -R with heredoc input for php script?

@DaveRandom In bash, Here String needs three < and Here Document two <. — Shiplu Mokaddim
– Shiplu Mokaddim, Commented Dec 27, 2011 at 21:29
@Shiplu I retract my pedantry and admit defeat (in that I had never come across that in the context of bash before). Comment shall be deleted... — DaveRandom
– DaveRandom, Commented Dec 27, 2011 at 21:32
@DaveRandom: Pedanticism requires that you stop writing apostrophes in inappropriate places. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Dec 27, 2011 at 21:37
@TomalakGeret'kal I'm not even going to begin to get into a debate about the precise semantic use of the possessive apostrophe, it is a debate that will never end. You may enjoy this... — DaveRandom
– DaveRandom, Commented Dec 27, 2011 at 21:52
@DaveRandom: You should follow that advice... I'm not aware of any debate over when an apostrophe should be used; only of many people who get it wrong. Also please stop abusing commas. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Dec 27, 2011 at 21:59

Shiplu Mokaddim · Accepted Answer · 2011-12-27 21:36:11Z

18

Piping

ls -l | php -r 'print_r(file("php://stdin"));'

Heredoc

$ php <<CODE
<?php
echo "Hello World\n";
?>
CODE
Hello World

Combined

$ ls -l | php <<'CODE'
<?php
$f = file("php://stdin");
foreach($f as $k=>$v){
echo "[$k]=>$v";
}
?>
Program Finished
CODE

[0]=><?php
[1]=>$f = file("php://stdin");
[2]=>foreach($f as $k=>$v){
[3]=>echo "[$k]=>$v";
[4]=>}
[5]=>?>
[6]=>Program Finished
Program Finished

Note: When you use Here Documents for php command the newly added php codes overrides the previous stdin

edited Dec 27, 2011 at 21:36

answered Dec 27, 2011 at 21:12

Shiplu Mokaddim

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2 Comments

Billy Moon Over a year ago

So what you are saying is that when you combine piping and heredoc, the piped part is trampled by the heredoc part, and can not be retrieved?

Shiplu Mokaddim Over a year ago

@BillyMoon yes. It can not be retrived.

Community · Accepted Answer · 2020-06-20 09:12:55Z

3

Regarding the -R part of the question:

-R / --process-code

PHP code to execute for every input line. Added in PHP 5.

There are two special variables available in this mode: $argn and $argi. $argn will contain the line PHP is processing at that moment, while $argi will contain the line number. ^Docs

If I understood your question right, you're looking for the $argn variable. Heredoc should be support by your bash.

Edit: Err, just invoke with the value over multiple lines:

$ ls -l | php -R '
printf("#%02d: %s\n", $argi, $argn);
'

(I think it's easier to use the single quote for the switch)

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered Dec 27, 2011 at 21:24

hakre

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6 Comments

Billy Moon Over a year ago

I can not figure out how to pass a heredoc to php -R instead of a string, and I am not sure that it is possible directly.

hakre Over a year ago

My bad, just try a multiline "string" instead of a heredoc. Edited the question to reflect that.

Billy Moon Over a year ago

Wow, multi-line string - what a revelation. Simple, and elegant - I ad no idea... I have been spending too much time writing javascript lately!

Billy Moon Over a year ago

I found that if I use ' to define the multi-line string, I don't have to escape so much of my php code, but is there any way I can avoid escaping the ' inside my php code - so probably use a different token to delimit a multi-line string?

hakre Over a year ago

@BillyMoon: Better use the single quote for the parameter with PHP code. You don'T need to escape that much.

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