Echo in one line but in loop situation

Question

I have the following code:

$data  = ['a','b','c'];
$total = count($data);
for($i = 0; $i < $total; $i++) {
    echo $data;
}

What I need is when the code is running in cmd, the cmd will output each character so that it replaces the previous character in the display, like this:

a >> then changing to show b >> then changing to show c

...only in one line.

imagine that in line 3 of cmd will show the word alternately (a -> b -> c)

I have tried with "\r" but the result is nothing in cmd. Please can you help?

I am not doing your homework ;) But you should have a look at the `$total` variable, where is it declared? And you are echo'ing the complete `$data` array from inside your loop. Have a look at this: https://www.w3schools.com/php/php_looping_for.asp — Erik van de Ven, Oct 24 '18 at 12:30
Sorry it is not clear how you want the output to look. Can you edit the question and show your expected output please — RiggsFolly, Oct 24 '18 at 12:30
On *nixy systems you can do something like: echo $data . " \r"; — jaxwilko, Oct 24 '18 at 12:31
@RiggsFolly `PHP_EOL` is useless nowadays though where `\n` works on all systems. — Xatenev, Oct 24 '18 at 12:34
@RiggsFolly no, you misunderstand, just printing " \r" will update the current line rather than adding a new line, i.e. for loading bars — jaxwilko, Oct 24 '18 at 12:35
@Xatenev Oh, does `"\n"` work on all systems. I didn't know that — RiggsFolly, Oct 24 '18 at 12:35
@JackWilko Ahhhh! I wonder if that is what the OP is trying to say? You could be right!! Hmmmmm — RiggsFolly, Oct 24 '18 at 12:37
@AligaMyway Can you just show the expected output instead of an explanation of the expected output? E.g. **Wanted output:** `a/b/c` — Xatenev, Oct 24 '18 at 12:39
imagine that in line 3 of cmd will show the word alternately (a -> b -> c) sorry my english is bad — Aliga Myway, Oct 24 '18 at 12:42
So you want line 1 to output "a", line 2 to output "a -> b" and line 3 to output "a -> b -> c"? — Stefmachine, Oct 24 '18 at 12:44
What if OP is looking something similar to a loading feedback on which each array item is displayed as a feedback to a loading sequence? Like $data = ['loading x','loading y','loading z']; It then makes sense when he asks to show them alternatively (just guessing BTW) — Ace_Gentile, Oct 24 '18 at 12:44
Hi @AligaMyway, I added a gif to show what I think you're trying to do. Is that right? — Don't Panic, Oct 24 '18 at 13:30

score 5 · Accepted Answer · answered Oct 24 '18 at 12:42

5

I suppose this is what you want. Correct me if I'm wrong. It first prints a, then replaces it with b, then replaces it with c.

$data  = ['a','b','c'];
$total = count($data);
for($i = 0; $i < $total; $i++) {
    echo "\033[1D";      // Move 1 character backward
    echo $data[$i];  
    sleep(1);           // wait for a while, so we see the animation
}

answered Oct 24 '18 at 12:42

Erik van de Ven

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what i mean is like this – Aliga Myway Oct 24 '18 at 12:45
You're welcome, for more information about this, check https://stackoverflow.com/questions/5265288/update-command-line-output-i-e-for-progress – Erik van de Ven Oct 24 '18 at 12:46
Ah, the question makes much more sense knowing this is the answer. All the rest of us thought it was a more simple misunderstanding. Well done :-) – Don't Panic Oct 24 '18 at 12:51
but i dont know that in my real code i must add echo "\r" before echo "\033[1D" to make this working – Aliga Myway Oct 24 '18 at 12:52
@AligaMyway not sure what you mean, why should you add `echo "\r"` to make this work? – Erik van de Ven Oct 24 '18 at 12:56

Hiren Siddhpura · Answer 2 · 2018-10-24T14:03:32.193

-1

do like this:

$data = ['a','b','c'];

go with foreach like below:

foreach($data as $d) {
   echo "\033[1D";
    echo $d;
    sleep(1);
}

edited Oct 24 '18 at 14:03

answered Oct 24 '18 at 12:32

Hiren Siddhpura

189
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8

cmd will show all of word, hmmm i need that cmd will show the word in one line – Aliga Myway Oct 24 '18 at 12:35
llike this, imagine that in line 3 will show the data alternately a/b/c – Aliga Myway Oct 24 '18 at 12:36

score -1 · Answer 3 · edited Oct 24 '18 at 12:37

-1

I hope this is what you want...

$data = ['a','b','c'];
$total = count($data);

for ($i=0; $i < $total; $i++){
    echo $data[$i] . "\n";
}

edited Oct 24 '18 at 12:37

Barry

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answered Oct 24 '18 at 12:36

Niraj Kaushal

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Echo in one line but in loop situation

3 Answers3