PHP extension: convert an object to string with __toString()

Question

Writing a PHP extension in C, I want to convert a userland object (IS_OBJECT) to a string through __toString() if it has one, and fail otherwise. What should I use? I don't need another zval on output, just a char *.

zval *zo;

switch (Z_TYPE_P(zo)) {
case IS_STRING:
    ... Z_STRVAL_P(zo) ...
    break;
case IS_OBJECT:
    ... ???(zo) ...
    break;
...
}

VolkerK · Accepted Answer · 2010-01-15 13:54:07Z

1

The reflection module does something like

ZVAL_STRINGL(&fname, "__tostring", sizeof("__tostring") - 1, 1);
result= call_user_function_ex(NULL, &object, &fname, &retval_ptr, 0, NULL, 0, NULL TSRMLS_CC);
zval_dtor(&fname);

if (result == FAILURE) {
    _DO_THROW("Invocation of method __toString() failed");
    /* Returns from this function */
}

And then you'd extract the char* with Z_STRVAL_P().
But I guess you could also use

case IS_OBJECT:
  if ( SUCCESS==zend_std_cast_object_tostring(uservar, uservar, IS_STRING TSRMLS_CC) ) {
    int len = Z_STRLEN_P(uservar);
    char* pValue = Z_STRVAL_P(uservar);
    ...
  }

zend_std_cast_object_tostring() is implemented in zend/zend_object_handlers.c. You might want to check if it really does what you want

answered Jan 15, 2010 at 13:54

VolkerK

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just somebody Over a year ago

Thanks for the answer. In the end I've settled with zend_make_printable_zval (defined in Zend/zend.c): the SPL snippet is ugly, and zend_std_cast_object_tostring includes behavior which breaks requirements I didn't mention in my question (sorry about that).

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