How to create php file using php - php

Question

I'm trying to create multiple .php files using php itself.
I want to put some code into a file; most of code is the same but only one or two variables that I wanted to be dynamic. I mean every file that I make are exactly like each other the only difference between theme is one variable.
My function is this:
function generate_corn_files()
{
$C = $GLOBALS['C'];
$db = $GLOBALS['db'];
//delete all contents of folder
RemoveDir($C->INCPATH.'cron/feed/', false);
$res = $db->query('SELECT id FROM category ');
while($cat = $db->fetch_object($res)) {
$id = $cat->id;
$open_output = <<<'PHP'
<?php
$outter_id = $id;
if($example = true){
echo 'test';
echo $C->INCPATH;
}
?>
PHP;
$fp=fopen($C->INCPATH.'cron/feed/filename_'.$id.'.php','w');
fwrite($fp, $open_output);
fclose($fp);
}
}
I tried to put content of file using heredoc but I want to $id in $outter_id = $id; be equal to $id = $cat->id;
it's a variable outside of heredoc I can't make it work inside of it !
Are there any other solutions to make it work ?

Answer 1

You aren't using HEREDOC syntax but rather NOWDOC syntax. If you use HEREDOC, all variables inside will be evaluated, so you will have to escape with \$ the variables you don't want evaluated.
$open_output = <<<PHP
<?php
\$outter_id = $id;
if(\$example = true){
echo 'test';
echo \$C->INCPATH;
}
?>
PHP;
Or, you can stick with NOWDOC, use a placeholder, and replace it afterwards.
$open_output = <<<'PHP'
<?php
$outter_id = %%%id%%%;
if($example = true){
echo 'test';
echo $C->INCPATH;
}
?>
PHP;
str_replace("%%%id%%%", $id, $open_output);

Answer 2

Maybe this could inspire you
function generate_corn_files()
{
$C = $GLOBALS['C'];
$db = $GLOBALS['db'];
//delete all contents of folder
RemoveDir($C->INCPATH.'cron/feed/', false);
$res = $db->query('SELECT id FROM category ');
while($cat = $db->fetch_object($res)) {
$id = $cat->id;
$open_output = <<<'PHP'
<?php
$outter_id = $id;
if($example = true){
echo 'test';
echo $C->INCPATH;
}
?>
PHP;
$php_var_name_pattern = '/\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)/';
$open_output = preg_replace_callback(
$php_var_name_pattern,
function($matches) {
if(isset($GLOBALS[$matches[1]])) {
if(is_string($GLOBALS[$matches[1]])) {
return '\''.$GLOBALS[$matches[1]].'\'';
} else {
return $GLOBALS[$matches[1]];
}
} else {
return $matches[0];
}
},
$open_output);
$fp=fopen($C->INCPATH.'cron/feed/filename_'.$id.'.php','w');
fwrite($fp, $open_output);
fclose($fp);
}
}