php中如何使用C语言写扩展

string my_test_function(string str,int n)

./ext_skel --extname=extend_test --proto=extend_test.def

PHP_ARG_ENABLE(extend_test, whether to enable extend_test support,
Make sure that the comment is aligned:
[  --enable-extend_test           Enable extend_test support])

PHP_FUNCTION(my_test_function)
{
    char *str = NULL;
    int argc = ZEND_NUM_ARGS();
    size_t str_len;
    zend_long n;
    char *result;
    char *ptr;
    zend_long result_length;
    if (zend_parse_parameters(argc TSRMLS_CC, "sl", &str, &str_len, &n) == FAILURE)
        return;
    result_length = str_len * n;
    result = (char *) emalloc(result_length + 1);
    ptr = result;
    while (n--) {
        memcpy(ptr, str, str_len);
        ptr += str_len;
    }
    *ptr = '\0'; 
    RETURN_STRINGL(result, result_length);
}

make             
make install

extension=extend_test.so

<?php
echo my_test_function(&#39;a&#39;,5);