Question

i want to create an extension for php with visual studio 2010 , i am beginner in c++.
my last function in C++ is :

PHP_FUNCTION(DoubleUp){
    char* text;
    int len;
    char string[255];
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &text) == FAILURE) {
        RETURN_STRING("Invalid Parameters",true);
    } 
      len = sprintf(string,"echo 'hello %.78s'", text);
      RETURN_STRINGL(string,len, 1);
}

and in php i use :

echo DoubleUp('sss');

but output is : echo 'hello Ыõ'
that should be : echo 'hello sss'
argument is a very long string .
now i don’t know what should i do .
thanks …

Answer 1

The problem with your code is, that zend_parse_parameters returns a zval if you specify "z" in the “type specifier” (the third parameter of zend_parse_parameters).

To get the correct string you can get the string directly using “s”:

if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &text, &len) == FAILURE) {

In that case you have to supply the pointer to the char* for the string plus a pointer to an int to hold the string length.

The second solution is to use the zval correctly and get the string out of the zval:

zval* text;
int len;
char string[255]      
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &text) == FAILURE) { 
    /* ... */ 
}

// cast the value to string
convert_to_string(text);

// get the string value with the Z_STRVAL_P macro (Z_STRLEN_P for the length)
len = sprintf(string,"echo 'hello %.78s'", Z_STRVAL_P(text));