Add before and after the string

Question

$variable = 'for linebreak add 2 spaces at end';

Value of this variable everytime changes.

How to add some text or html before and after this string?

E.g. if we want to add '<div>' before and '</div>' after, string should look like:

$variable = '<div>for linebreak add 2 spaces at end</div>';

how is this different from the question you posted 15 minutes ago? Are you having a hard time understanding string concatenation? (No snark intended) — Zak
– Zak, Commented Sep 13, 2010 at 21:45

pixeline · Accepted Answer · 2017-12-05 15:06:20Z

13

$wrapped_variable = '<div>' . $variable . '</div>';

edited Dec 5, 2017 at 15:06

pixeline

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answered Sep 13, 2010 at 21:39

Marko

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1 Comment

Strae Over a year ago

@Happy: why you think this is not a solution?

pixeline · Accepted Answer · 2010-09-13 21:46:54Z

4

Marko's solution is the way to go for simple cases. If you need to concatenate many strings, it is said that joining arrays is much faster.

$string[]='<div>';
$string[]= $variable;
$string[]='</div>';
$string = join('',$string);

answered Sep 13, 2010 at 21:46

pixeline

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3 Comments

Nolwennig Over a year ago

For the system time, the faster way (0.003 second) is to use join arrays (with unset) in PHP 7.2.0.

Nolwennig Over a year ago

For the user time, the faster way (0.003 second) is to use oneline concatenation without unset in PHP 7.0.22.

Nolwennig Over a year ago

For memory usage, the "most ecomonical" (14.47 MiB) way is to use join array without unset in PHP 7.0.14.

matsolof · Accepted Answer · 2010-09-19 19:46:36Z

2

I'm not sure I understand what you want. Is this it?

<?php
function add_div($string){return '<div>'.$string.'</div>';}
$variable = 'for linebreak add 2 spaces at end'; 
echo add_div($variable); // <div>for linebreak add 2 spaces at end</div>
?>

If it isn't, say so and I will try again the next time I visit this page.

answered Sep 19, 2010 at 19:46

matsolof

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Comments

Nolwennig · Accepted Answer · 2017-12-04 14:07:19Z

What is the faster ways?

1. Join arrays?

1.1 Join arrays (with unset)

The code below :

for($i=1;$i<1000;$i++){
    $string[]='lorem_';
    $string[]= $i;
    $string[]='_ipsum';
    $string = join('',$string);
    var_dump($string);
    unset($string);
}

generate this average performance:

.---------.----------------.--------------.--------------.
| Version | System time(s) | User time(s) | Memory (MiB) |
|---------|----------------|--------------|--------------|
|   5.6   |      0.016     |     0.061    |    20.60     |
|   7.0   |      0.009     |     0.010    |    16.69     |
|   7.1   |      0.011     |     0.011    |    24.18     |
|   7.2   |      0.003     |     0.017    |    19.41     |
'---------'----------------'--------------'--------------'

source: https://3v4l.org/8YK1H/perf#output

1.2 Join arrays (without unset)

The code below :

for($i=1;$i<1000;$i++){
    $string = [];
    $string[]='lorem_';
    $string[]= $i;
    $string[]='_ipsum';
    $string = join('',$string);
    var_dump($string);
    // unset($string);
}

generate this average performance:

.---------.----------------.--------------.--------------.
| Version | System time(s) | User time(s) | Memory (MiB) |
|---------|----------------|--------------|--------------|
|   5.6   |      0.017     |     0.068    |    20.58     |
|   7.0   |      0.012     |     0.013    |    16.13     |
|   7.1   |      0.021     |     0.012    |    23.23     |
|   7.2   |      0.013     |     0.010    |    17.65     |
'---------'----------------'--------------'--------------'

source: https://3v4l.org/kU4QG/perf#output

2. Shorthand operator?

2.1 Shorthand operator (with unset)

The code below :

for($i=1;$i<1000;$i++){
    $string = 'lorem_';
    $string .= $i;
    $string .= '_ipsum';
    // $string = join('',$string);
    var_dump($string);
    unset($string);
}

generate this average performance:

.---------.----------------.--------------.--------------.
| Version | System time(s) | User time(s) | Memory (MiB) |
|---------|----------------|--------------|--------------|
|   5.6   |      0.012     |     0.059    |    20.60     |
|   7.0   |      0.008     |     0.011    |    16.65     |
|   7.1   |      0.014     |     0.012    |    24.22     |
|   7.2   |      0.012     |     0.009    |    19.08     |
'---------'----------------'--------------'--------------'

source: https://3v4l.org/cCoSC/perf#output

2.2 Shorthand operator (without unset)

The code below :

for($i=1;$i<1000;$i++){
    $string = 'lorem_';
    $string .= $i;
    $string .= '_ipsum';
    // $string = join('',$string);
    var_dump($string);
    // unset($string);
}

generate this average performance:

.---------.----------------.--------------.--------------.
| Version | System time(s) | User time(s) | Memory (MiB) |
|---------|----------------|--------------|--------------|
|   5.6   |      0.011     |     0.059    |    20.60     |
|   7.0   |      0.008     |     0.011    |    16.70     |
|   7.1   |      0.014     |     0.011    |    24.22     |
|   7.2   |      0.010     |     0.010    |    19.33     |
'---------'----------------'--------------'--------------'

source: https://3v4l.org/iKnaV/perf#output

3. One line concat?

3.1 One line concatenation (with unset)

The code below :

for($i=1;$i<1000;$i++){
    $string = 'lorem_' . $i . '_ipsum';
    // $string .= $i;
    // $string .= '_ipsum';
    // $string = join('',$string);
    var_dump($string);
    unset($string);
}

generate this average performance:

.---------.----------------.--------------.--------------.
| Version | System time(s) | User time(s) | Memory (MiB) |
|---------|----------------|--------------|--------------|
|   5.6   |      0.015     |     0.066    |    20.60     |
|   7.0   |      0.008     |     0.012    |    16.68     |
|   7.1   |      0.014     |     0.014    |    24.23     |
|   7.2   |      0.010     |     0.014    |    19.45     |
'---------'----------------'--------------'--------------'

source: https://3v4l.org/tv4X0/perf#output

3.2 One line concatenation (without unset)

The code below :

for($i=1;$i<1000;$i++){
    $string = 'lorem_' . $i . '_ipsum';
    // $string .= $i;
    // $string .= '_ipsum';
    // $string = join('',$string);
    var_dump($string);
    // unset($string);
}

generate this average performance:

.---------.----------------.--------------.--------------.
| Version | System time(s) | User time(s) | Memory (MiB) |
|---------|----------------|--------------|--------------|
|   5.6   |      0.012     |     0.056    |    20.65     |
|   7.0   |      0.008     |     0.008    |    16.69     |
|   7.1   |      0.014     |     0.010    |    24.17     |
|   7.2   |      0.007     |     0.011    |    19.39     |
'---------'----------------'--------------'--------------'

source: https://3v4l.org/mF0YW/perf#output

If merge all results by PHP version:

`PHP 5.6`

.-------------.----------------.--------------.--------------.
|     Code    | System time(s) | User time(s) | Memory (MiB) |
|-------------|----------------|--------------|--------------|
|         1.1 |      0.016     |     0.061    |    20.60     |
|         1.2 |      0.017     |     0.068    | >> 20.58     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 1 |      0.0165    |     0.0645   | >> 20.59     |
|-------------|----------------|--------------|--------------|
|         2.1 |      0.012     |     0.059    |    20.60     |
|         2.2 |   >> 0.011     |     0.059    |    20.60     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 2 |   >> 0.0115    |  >> 0.059    |    20.60     |
|-------------|----------------|--------------|--------------|
|         3.1 |      0.015     |     0.066    |    20.60     |
|         3.2 |      0.012     |  >> 0.056    |    20.65     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 3 |      0.0135    |     0.061    |    20.625    |
'-------------'----------------'--------------'--------------'

`PHP 7.0`

.-------------.----------------.--------------.--------------.
|     Code    | System time(s) | User time(s) | Memory (MiB) |
|-------------|----------------|--------------|--------------|
|         1.1 |      0.009     |     0.010    |    16.69     |
|         1.2 |      0.012     |     0.013    | >> 16.13     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 1 |      0.0105    |     0.0115   | >> 16.41     |
|-------------|----------------|--------------|--------------|
|         2.1 |   >> 0.008     |     0.011    |    16.65     |
|         2.2 |   >> 0.008     |     0.011    |    16.70     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 2 |   >> 0.008     |     0.011    |    16.675    |     
|-------------|----------------|--------------|--------------|
|         3.1 |   >> 0.008     |     0.012    |    16.68     |
|         3.2 |   >> 0.008     |  >> 0.008    |    16.69     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 3 |   >> 0.008     |  >> 0.010    |    16.685    |
'-------------'----------------'--------------'--------------'

`PHP 7.1`

.-------------.----------------.--------------.--------------.
|     Code    | System time(s) | User time(s) | Memory (MiB) |
|-------------|----------------|--------------|--------------|
|         1.1 |   >> 0.011     |     0.011    |    24.18     |
|         1.2 |      0.021     |     0.012    | >> 23.23     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 1 |      0.016     |  >> 0.0115   | >> 23.705    |
|-------------|----------------|--------------|--------------|
|         2.1 |      0.014     |     0.012    |    24.22     |
|         2.2 |      0.014     |     0.011    |    24.22     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 2 |   >> 0.014     |  >> 0.0115   |    24.22     |
|-------------|----------------|--------------|--------------|
|         3.1 |      0.014     |     0.014    |    24.23     |
|         3.2 |      0.014     |  >> 0.010    |    24.17     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 3 |   >> 0.014     |     0.012    |    24.20     |
'-------------'----------------'--------------'--------------'

`PHP 7.2`

.-------------.----------------.--------------.--------------.
|     Code    | System time(s) | User time(s) | Memory (MiB) |
|-------------|----------------|--------------|--------------|
|         1.1 |   >> 0.003     |     0.017    |    19.41     |
|         1.2 |      0.013     |     0.010    | >> 17.65     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 1 |   >> 0.008     |     0.0135   | >> 18.53     |
|-------------|----------------|--------------|--------------|
|         2.1 |      0.012     |  >> 0.009    |    19.08     |
|         2.2 |      0.010     |     0.010    |    19.33     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 2 |      0.011     |  >> 0.0905   |    19.205    |
|-------------|----------------|--------------|--------------|
|         3.1 |      0.010     |     0.014    |    19.45     |
|         3.2 |      0.007     |     0.011    |    19.39     |
|             |-- -- -- -- -- -|-- -- -- -- --|-- -- -- -- --|
| (average) 3 |      0.0085    |     0.0125   |    19.42     |
'-------------'----------------'--------------'--------------'

Conclusion

For the system time, the faster way (0.003 second) is to use join arrays (with unset) in PHP 7.2.0.
For the user time, the faster way (0.003 second) is to use oneline concatenation without unset in PHP 7.0.22.
For memory usage, the "most ecomonical" (14.47 MiB) way is to use join array without unset in PHP 7.0.14.

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Add before and after the string

4 Answers 4

1 Comment

3 Comments

Comments

What is the faster ways?

1. Join arrays?

1.1 Join arrays (with unset)

1.2 Join arrays (without unset)

2. Shorthand operator?

2.1 Shorthand operator (with unset)

2.2 Shorthand operator (without unset)

3. One line concat?

3.1 One line concatenation (with unset)

3.2 One line concatenation (without unset)

`PHP 5.6`

`PHP 7.0`

`PHP 7.1`

`PHP 7.2`

Conclusion

Comments

Your Answer

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Collectives™ on Stack Overflow

4 Answers 4

1 Comment

3 Comments

Comments

What is the faster ways?

1. Join arrays?

1.1 Join arrays (with unset)

1.2 Join arrays (without unset)

2. Shorthand operator?

2.1 Shorthand operator (with unset)

2.2 Shorthand operator (without unset)

3. One line concat?

3.1 One line concatenation (with unset)

3.2 One line concatenation (without unset)

PHP 5.6

PHP 7.0

PHP 7.1

PHP 7.2

Conclusion

Comments

Your Answer

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`PHP 5.6`

`PHP 7.0`

`PHP 7.1`

`PHP 7.2`