Url-encode all ampersands found in a 1d array of strings

Question

I would like to do a string replacement in all items in an array. What I have is:

$row['c1'] = str_replace("&", "&amp;", $row['c1']);
$row['c2'] = str_replace("&", "&amp;", $row['c2']);
$row['c3'] = str_replace("&", "&amp;", $row['c3']);
$row['c4'] = str_replace("&", "&amp;", $row['c4']);   
$row['c5'] = str_replace("&", "&amp;", $row['c5']);
$row['c6'] = str_replace("&", "&amp;", $row['c6']);
$row['c7'] = str_replace("&", "&amp;", $row['c7']);   
$row['c8'] = str_replace("&", "&amp;", $row['c8']);
$row['c9'] = str_replace("&", "&amp;", $row['c9']);
$row['c10'] = str_replace("&", "&amp;", $row['c10']);

How can I achieve this with less code? I thought a foreach statement would work, e.g.:

$columns = array($row['c1'], $row['c2'], $row['c3'], $row['c4'], $row['c5'], $row['c6'], $row['c7'], $row['c8'], $row['c9'], $row['c10']);

foreach ( $columns as $value){
   $value   = str_replace("&", "&amp;", $value);
}

But it doesn't work.

Is this an XY Problem?

mickmackusa
– mickmackusa ♦

2022-07-30 05:30:06 +00:00
Commented Jul 30, 2022 at 5:30 — mickmackusa
– mickmackusa ♦, Commented Jul 30, 2022 at 5:30

flig · Accepted Answer · 2012-10-10 15:51:25Z

35

Just do:

$row = str_replace("&", "&amp;", $row);

Note: Your foreach doesn't work because you need a reference, or use the key:

foreach ( $columns as &$value) { // reference
   $value  = str_replace("&", "&amp;", $value);
}
unset($value); // break the reference with the last element

Or:

foreach ($columns as $key => $value){
   $columns[$key]  = str_replace("&", "&amp;", $value);
}

Although it is not necessary here because str_replace accepts and returns arrays.

edited Oct 10, 2012 at 15:51

flig

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answered Feb 18, 2011 at 18:25

netcoder

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2 Comments

Ish Over a year ago

you got it man ... I wasn't aware str_replace accepts arrays too

DIM3NSION Over a year ago

How would you use this method to replace a string in the second part of an array. ('array string 1','array string 2') this is an example row.

Ish · Accepted Answer · 2011-02-18 18:26:53Z

2

You should call it by reference, otherwise foreach creates a duplicate copy of $value

foreach ( $columns as &$value)

answered Feb 18, 2011 at 18:26

Ish

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Comments

Joshua · Accepted Answer · 2017-06-09 21:18:40Z

1

Another solution to is to use PHP array_walk like this:

function custom_replace( &$item, $key ) {
   $item = str_replace('22', '75', $item);
} 

// Init dummy array.
$columns = array('Cabbage22', 'Frid22ay', 'Internet', 'Place22', '22Salary', '22Stretch', 'Whale22Inn');

// Print BEFORE.
echo 'Before: ';
print_r($columns);

// Make the replacements.
array_walk($columns, 'custom_replace');

// Print AFTER.
echo 'After:';
print_r($columns);

Output:

Before: Array
(
    [0] => Cabbage22
    [1] => Frid22ay
    [2] => Internet
    [3] => Place22
    [4] => 22Salary
    [5] => 22Stretch
    [6] => Whale22Inn
)
After: Array
(
    [0] => Cabbage75
    [1] => Frid75ay
    [2] => Internet
    [3] => Place75
    [4] => 75Salary
    [5] => 75Stretch
    [6] => Whale75Inn
)

edited Jun 9, 2017 at 21:18

Joshua

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answered May 19, 2015 at 9:33

mr.baby123

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