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$chunk = substr($string,0,rindex($string,' ',200));

Benchmark: running japhy, rindex, tye, each for at least 3 CPU seconds
+...
     japhy:  2 wallclock secs ( 3.00 usr +  0.00 sys =  3.00 CPU) @ 24
+4478.67/s (n=733436)
    rindex:  3 wallclock secs ( 3.00 usr +  0.00 sys =  3.00 CPU) @ 84
+2494.33/s (n=2527483)
       tye:  4 wallclock secs ( 3.39 usr +  0.00 sys =  3.39 CPU) @ 30
+5243.95/s (n=1034777)