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表 32-1argument conversion functions
longs and doubles are converted to their corresponding string representation.

図 32-2cross-conversion behavior of php.
figure 32-2 shows the output.

note: all conversion functions expect a **zval as parameter.
strings containing a number are converted to their corresponding numeric representation, otherwise resulting in 0.0.

following is a quote from the sample module discussed previously, which makes use of the conversion functions:
zval **parameter; if((zend_num_args() != 1) _bar_ _bar_ (zend_get_parameters_ex(1, parameter) != success)) {wrong_param_count;} convert_to_long_ex(parameter); return_long(z_lval_p(parameter));

an optional number, a width specifier that says how many characters (minimum) this conversion should result in.
c - the argument is treated as an integer, and presented as the character with that ascii value.

注意 although this function will not perform the conversion, some internal stream state *might* be changed by this call.
although this function will not perform the conversion, some internal stream state *might* be changed by this call.

the iso-8859-1 character set is used as default for the optional third charset. this defines the character set used in conversion.
the iso-8859-1 character set is used as default for the optional third charset.

in addition to the basic resource types above, the conversion process can be altered by using the following flags by using the or operator to combine the resource type with one or more of the following values:
this causes the stream to be closed in such a way the underlying handle is preserved and returned in ret.

biological sciences university of alberta edmonton, alberta, canada ; paul meems, topx geo-ict the netherlands (rst conversion)
biological sciences university of alberta edmonton, alberta, canada ; paul meems, topx geo-ict the netherlands (rst conversion)

after the declaration, code for checking and retrieving the function's arguments, argument conversion, and return value generation follows (more on this later).
after the declaration, code for checking and retrieving the function' s arguments, argument conversion, and return value generation follows (more on this later).

if required, the dynamic loadable module is loaded by calling the dl() function. this function looks for the specified shared object, loads it, and makes its functions available to php. the module exports the function first_module(), which accepts a single parameter, converts it to an integer, and returns the result of the conversion.
the module exports the function first_module(), which accepts a single parameter, converts it to an integer, and returns the result of the conversion.