Programming PHP

usleep
void usleep(int time)
Pauses execution of the current script for time microseconds.
usort
void usort(array array, string function)
Sorts an array using a user-defined function. The supplied function is called with two
parameters. It should return an integer less than 0 if the first argument is less than the
second, 0 if the first and second arguments are equal, and an integer greater than 0 if the
first argument is greater than the second. The sort order of two elements that compare
equal is undefined. See Chapter 5 for more information on using this function.
var_dump
void var_dump(mixed name[, mixed name2[, ... mixed nameN]])
Outputs information, including the variable’s type and value, about the given variables.
The output is similar to that provided by print_r( ).
version_compare
int version_compare(string one, string two[, string operator])
Compares two strings of the format “4.1.0” and returns -1 if one is less than two, 0 if they
are equal, and 1 if one is greater than two. Ifoperator is specified, the operator is used to
make a comparison between the version strings, and the value of the comparison using that
operator is returned. The possible operators are < or lt; or gt; >= or ge; ==, =, or
eq; and !=, , and ne.
vprintf
void vprintf(string format[, array values])
Prints a string created by filling format with the arguments given in the array values. See
printf for more information on using this function.
vsprintf
string vsprintf(string format[, array values])
Creates and returns a string created by filling format with the arguments given in the array
values. See printf for more information on using this function.
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