How do I get the return value of a c++ function in php code?
Question
It's a beginner question but I researched a lot and barely found anything. Many articles or examples on zend don't exist anymore and I cant really make progress so bare with me. I'd like to get the result from an existing c++ function to use it in php code. I set up a super simple example: My c++ code looks like the following for now:
#include<iostream>
int returnnumber() {
return 4 + 2;
}
int main() {
std::cout << "test";
return 0;
}
and my php code looks like this:
<html>
<head>
<title>PHP-Test</title>
</head>
<body>
<?php
$filename = "pathtofile";
if (file_exists($filename)) {
echo "the file exists, ";
} else {
echo "The file doesnt exist";
}
$output = 0;
$output = shell_exec($filename);
//$output = 2
echo $output; ?>
</body>
</html>
The output for this is the file exists, test However, when I remove the comments of $output = 2 the result becomes the file exists, 2 which I really don't understand. Why is $output my cout string value and not my return integer value from my main function, so 0 in this case? And how do I get the value 0, and additionally,how would I get the result of,in this case, int returnnumber() ?
1 answers
solution1
0 2022-01-28 18:55:52
You can try this:
<?php
$out = shell_exec("date > /dev/null 2>&1; echo $?");
echo "result is: $out";
?>
This is how we get exit status of any command in shell. You execute the command and check the value of $? (and probably divide it by 256 but not in this case).
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