PHP的foreach替换变量

Question

I want to use a template file, where i am using {value} as markers to replace that with a value.

The variable is set like $order and I want to replace it in the template where there is {order}.

There are about 50 of these variables I want to replace.

Is there a way to do this automaticly?

$text = file_get_contents("bol_files/order_template.txt");
    $text = str_replace("{ordernummer}",$bestelnummer, $text);
    $text = str_replace("{verzendwijze}",$verzendwijze, $text);
    echo $text;

Answer 1

You could use strtr function.

$text = file_get_contents("bol_files/order_template.txt");
$trans = array(
    '{ordernummer}' => $bestelnummer, 
    '{verzendwijze}'   => $verzendwijze,
    ......
);
echo strtr($text, $trans);

Update: If your rule is fixed (replace {var_name} with $var_name ), then you could use regex replace.

echo preg_replace('/\{([^}]+)\}/e',  '${\'$1\'}' , $text );

Check the example.

Addition: but e marker is deprecated (you could use preg_replace_callback instead, but in that way, you need to import these variables into the scope of the callback function), I think you'd better hold the data in an array instead of separate variables, even if you could use get_defined_vars .

Answer 2

IMO, the easiest would be to collect the template vars in an array in the first place instead of using individual variables. Then you could simply pass the array as a whole to str_replace .

If the above is not an option, you could use

• get_defined_vars — Returns an array of all defined variables

Example:

$a = 'foo';
$b = 'bar';
$c = 'baz';

$template = '{a} to the {b} to the {c}';

foreach (get_defined_vars() as $key => $val) {
     if (is_scalar($val)) {
         $template = str_replace('{' . $key . '}', $val, $template);
     }
}
echo $template; // prints 'foo to the bar to the baz';

Demo

Alternative that does the same:

$a = 'foo';
$b = 'bar';
$c = 'baz';

$template = '{a} to the {b} to the {c}';

$scopeVars = array_filter(get_defined_vars(), 'is_scalar');
$templateMarker = preg_replace('/^.*$/', '{$0}', array_keys($scopeVars));
echo str_replace($templateMarker, $scopeVars, $template);

Demo

But note that this is potentially insecure when you let other people provide the template markers in the template. Since get_defined_vars gets you all the vars in the current scope , someone could try to guess variables that are not template values which might potentially contain sensitive data. Up to you to evaluate that risk.

Also note that I have added a check to see whether the scope variables hold a scalar value because if there is objects or arrays in the scope vars, PHP will complain about not being able to convert those to strings in str_replace .

Answer 3

str_replace can take arrays as arguments:

$text = str_replace(array_keys($replaceArray), $replacearray, $text);

where $replaceArray is an associative array

$replaceArray = (
  "{ordernummer}" => $bestelnummer,
  "{verzendwijze}" => $verzendwijze,
 and so on
);