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1.1     ! misho       1: --TEST--
        !             2: Test usleep() function : error conditions 
        !             3: --FILE--
        !             4: <?php
        !             5: /* Prototype  : void usleep  ( int $micro_seconds  )
        !             6:  * Description: Delays program execution for the given number of micro seconds. 
        !             7:  * Source code: ext/standard/basic_functions.c
        !             8:  */
        !             9:  
        !            10: set_time_limit(20); 
        !            11: 
        !            12: echo "*** Testing usleep() : error conditions ***\n";
        !            13: 
        !            14: echo "\n-- Testing usleep() function with zero arguments --\n";
        !            15: var_dump( usleep() );
        !            16: 
        !            17: echo "\n-- Testing usleep() function with more than expected no. of arguments --\n";
        !            18: $seconds = 10;
        !            19: $extra_arg = 10;
        !            20: var_dump( usleep($seconds, $extra_arg) );
        !            21: 
        !            22: echo "\n-- Testing usleep() function with negative interval --\n";
        !            23: $seconds = -10;
        !            24: var_dump( usleep($seconds) );
        !            25: 
        !            26: ?>
        !            27: ===DONE===
        !            28: --EXPECTF--
        !            29: *** Testing usleep() : error conditions ***
        !            30: 
        !            31: -- Testing usleep() function with zero arguments --
        !            32: 
        !            33: Warning: usleep() expects exactly 1 parameter, 0 given in %s on line %d
        !            34: NULL
        !            35: 
        !            36: -- Testing usleep() function with more than expected no. of arguments --
        !            37: 
        !            38: Warning: usleep() expects exactly 1 parameter, 2 given in %s on line %d
        !            39: NULL
        !            40: 
        !            41: -- Testing usleep() function with negative interval --
        !            42: 
        !            43: Warning: usleep(): Number of microseconds must be greater than or equal to 0 in %s on line %d
        !            44: bool(false)
        !            45: ===DONE===