I want to save a string in SQL such that each time it is called, part of the string is a variable. For example, if the string is "Hello my name is $name", I want to save it such that whenever it is retrieved, $name is still a variable:
$name = "Doug";
$row = mysql_fetch_array($mysql_query_result);
$message = $row['message']; // "Hello, my name is $name."
echo $message; // "Hello, my name is Doug."
One way would be:
str_replace('$name', $name, $message); // called before echo
I've never been too comfortable with variable variables, but from what I understand, a general function for the str_replace method could be made using them.
My question is whether or not this is necessary? Is there a much easier way to store a variable in SQL and keep it variable?
You could make it a format string for sprintf
.
$name = "Doug";
$row = mysql_fetch_array($mysql_query_result);
$message = sprintf($row['message'], $name); // "Hello, my name is %s."
echo $message; // "Hello, my name is Doug."
Or str_replace
as you said.
You could use eval() but I strongly suggest to not use it. Instead use a placeholder in your string and replace it when outputing, eg using sprintf() or str_replace() as you suggest.
You could also do it at the query level using replace()
:
//part of the query
$query .= "SELECT replace('message','\$name','{$name}')";
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