How to Replace Variables in a String Using strtr() in PHP?

Replacing a Variable in a String Using PHP

Many PHP applications require the ability to dynamically replace variables within strings. In the context of a database, a string may contain placeholders for variables that are not known until runtime. This article explores a PHP function that efficiently handles this task.

The Problem:

Consider the following string stored in a database:

I am a {$club} fan

When echoed using the following code:

$club = "Barcelona";
echo $data_base[0]['body'];

the output remains unchanged as "I am a {$club} fan" instead of the desired "I am a Barcelona fan."

The Solution:

PHP provides the strtr() function, specifically designed for translating portions of a string. To replace the {$club} placeholder with the value stored in $club, use the following code:

$club = "Barcelona";
echo strtr($data_base[0]['body'], array('{$club}' => $club));

This will result in the desired output: "I am a Barcelona fan."

Multiple Variable Replacement:

For situations where multiple variables need to be replaced, strtr() supports replacing multiple placeholders in one operation. For instance, the following code demonstrates replacing three placeholders:

$data_base[0]['body'] = 'I am a {$club} fan with {$tag} and {$anothertag}.';

$vars = array(
  '{$club}'       => 'Barcelona',
  '{$tag}'        => 'sometext',
  '{$anothertag}' => 'someothertext'
);

echo strtr($data_base[0]['body'], $vars);

This will produce the output: "I am a Barcelona fan with sometext and someothertext."

Conclusion:

strtr() provides an efficient method for variable replacement in strings. Whether working with database results, HTML content, or any other textual data, strtr() offers a concise and versatile solution.

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