Programming PHP

The parameter mode specifies the permissions to open the file with, which can only be
unidirectional (that is, for reading or writing only). mode must be one of the following:
If any error occurs while attempting to open the pipe, false is returned. If not, the resource
handle for the pipe is returned.
pos
mixed pos(array array)
This function is an alias for current( ).
pow
mixed pow(double base, double exponent)
Returns base raised to the exponent power. When possible, the return value is an integer; if
not, it is a double.
prev
mixed prev(array array)
Moves the internal pointer to the element before its current location and returns the value of
the element to which the internal pointer is now set. If the internal pointer is already set to
the first element in the array, returns false. Be careful when iterating over an array using this
function—if an array has an empty element or an element with a key value of 0, a value
equivalent to false is returned, causing the loop to end. If an array might contain empty
elements or an element with a key of 0, use the each( ) function instead of a loop with prev( ).
print
r Open file for reading; file pointer will be at beginning of file.
w Open file for writing. If the file exists, it will be truncated to zero length; if
the file doesn’t already exist, it will be created.
void print(string string)
Outputs string. Similar to echo, except that it takes a single argument.
print_r
bool print_r(mixed value)
Outputs value in a human-readable manner. If value is a string, integer, or double, the
value itself is output; if it is an array, the keys and elements are shown; and if it is an object,
the keys and values for the object are displayed. This function returns true.
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