php round 2e decimal to 0 or 5

Question

i want to round $t 2e decimal to 0 or 5.

 if $t= 1.31; //round to 1.30
 if $t= 1.32  //round to 1.30
 if $t= 1.33; //round to 1.35
 if $t= 1.34; //round to 1         


        

Answer 1

You can double the value so you can round to 1 decimal, then simple divide it by 2 again

$t = round(($t*2), 1) / 2;