Php dynamically replace placeholder variables in string [duplicate]

Question

I want to dynamically replace placeholder variables in a string.

str_replace("\$", $data["Whatever follows the \$], $variable);

\$ signifies a placeholder variable, \$ID for example.

The data I want it to be replace with is in an array. $\ID should be replaced with $data['ID'].

For example, if I have a string that says "The ID is \$ID and name is \$name". I want to replace both the \$ID and \$name with the relevant data in my $data object. $\ID would be $data['ID'] and so on.

This needs to be dynamic. I don't want to hard code it to replace \$ID with $data['ID']. The key used to get the data in $data should be equal to what follows the \$.

I'm having trouble figuring out not only how to do this dynamically like I have talked about, but to do it for every \$ in a string.

why not use printf?

Philipp Sander
– Philipp Sander

2017-07-25 11:31:34 +00:00
Commented Jul 25, 2017 at 11:31 — Philipp Sander
– Philipp Sander, Commented Jul 25, 2017 at 11:31

Gergely Lukacsy · Accepted Answer · 2017-07-25 11:42:38Z

1

Use printf() or sprintf().

If you mark your placeholder with a number, you can repeat it any number of times in your string.

sprintf("This is my test string. Here's a placeholder: %1$s, and a another: %2$s, First one again: %1$s", $var1, $var2);

answered Jul 25, 2017 at 11:42

Gergely Lukacsy

3,1222 gold badges27 silver badges29 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

katona.abel · Accepted Answer · 2017-07-25 11:45:48Z

0

Try this:

$string = 'some $ID $PARAM string';
$values = array("ID" => "idparam", "PARAM" => "p");

preg_match_all("/\\\$(?<name>[a-zA-Z0-9]+)/", $string, $matches);

foreach($matches["name"] as $m) {
    if(!isset($values[$m])) {
        //TODO handling
        continue;
    }
    $string = str_replace('$'.$m, $values[$m], $string);
}

var_dump($string);

The keys in $values should be name of the parameter without the dollar sign.

answered Jul 25, 2017 at 11:45

katona.abel

7714 silver badges12 bronze badges

Comments

delboy1978uk · Accepted Answer · 2017-07-25 11:45:58Z

0

This will do the job for you! https://3v4l.org/XRQii

<?php

$string = 'The ID is \$ID and name is \$name';
$row = [
  'ID'=> 5,
  'name' => 'delboy1978uk',
];


function replaceStuff($string, $row) {
    preg_match_all('#\\$\w+#', $string, $matches);
    foreach ($matches[0] as $match) {
        $key = str_replace('$', '', $match);
        $replace = '\\'.$match;
        $string = str_replace($replace, $row[$key], $string);
    }
    return $string;
}

echo replaceStuff($string, $row);

See http://php.net/manual/en/function.preg-match-all.php for more info on preg_match_all().

answered Jul 25, 2017 at 11:45

delboy1978uk

12.4k2 gold badges25 silver badges42 bronze badges

Collectives™ on Stack Overflow

Php dynamically replace placeholder variables in string [duplicate]

3 Answers 3

Comments

Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Linked

Related