Anyone familiar with PHP source code?

zend_parse开发者_如何学编程_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ss", &r1, &n, &r2, &m)

What's "ss" for here?

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The type specifier in your case is "ss". The specifier s is for a string. Since you are requesting two string parameters you need to supply two s as ss:

zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ss", &field1 &field1_length, 
                                                       &field2, &field2_length)

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"ss" is type_spec string

check this rosource out http://docstore.mik.ua/orelly/weblinux2/php/ch14_07.htm

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It is type_spec. Check here

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that php function expects 2 strings parameteres, that's why 2 s's. every string in php is defined by a pointer and a length. that's why you have

&r1, &n, -> 1st string &r2, &m -> 2nd string.