Store output of php_execute_script - php

Question

How can I store the output of php_execute_script() in a character array? php_execute_script() only prints the output.
Here's what I've got:
PHP_EMBED_START_BLOCK(argc, argv)
char string[200];
setbuf(stdout, string);
zend_file_handle file_handle;
zend_stream_init_filename(&file_handle, "say.php");
fflush(stdout);
if (php_execute_script(&file_handle) == FAILURE) {
php_printf("Failed to execute PHP script.\n");
}
setbuf(stdout, NULL);
printf("\"%s\" is what say.php has to say.\n", string);
PHP_EMBED_END_BLOCK()
I've tried redirecting stdout to string, but it doesn't even look like php_execute_script is actually writing to stdout! It just ignores it.
I'm trying to communicate with the PHP embedded script ("say.php") from C using the PHP SAPI after building PHP with embedding enabled.

Answer 1

Thinking that there's no such thing, I made an issue:
https://github.com/php/php-src/issues/9330
#include <sapi/embed/php_embed.h>
char *string[999] = {NULL};
int i = 0;
static size_t embed_ub_write(const char *str, size_t str_length){
string[i] = (char *) str; i++;
return str_length;
}
int main(int argc, char **argv)
{
php_embed_module.ub_write = embed_ub_write;
PHP_EMBED_START_BLOCK(argc, argv)
zend_file_handle file_handle;
zend_stream_init_filename(&file_handle, "say.php");
if (php_execute_script(&file_handle) == FAILURE) {
php_printf("Failed to execute PHP script.\n");
}
for (i = 0; string[i] != NULL; i++) {
printf("%s", string[i]);
}
PHP_EMBED_END_BLOCK()
}
You need to set php_embed_module.ub_write to a callback function that gets called every time PHP makes an echo.
It's weird how PHP doesn't write to stdout...
EDIT: As it turns out, it does. You just need to use pipe.