How to find and replace word in text from MySQL database?

A have a sentence:

"How to find and replace word in text from mysql database?"

And MySQL table words, with to 3 column id, word and replaceWord. I have more than 4000 words in databese.

Table:

id     word     replaceWord
 1     text     sentence
 2     word     letter
 3     mysql    MySQL
 4     ..       ...
 5     ..       ...
 6     ..       ...

Result:

"How to find and replace letter in sentence from MySQL database?"

I know how to do this without database, but i need database.

 <?php
$text="How to find and replace word in text from mysql database?";
$replaceWord=array(  "text" => "sentence", "word" => "letter", "mysql" => "MySQL");
echo strtr($tekst, $replaceWord);
?>

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