Implement FR #54459 (Range function accuracy) by changing the way range()

calculates values when used with floating point bounds/step.

ext/standard/array.c

@@ -1692,28 +1692,32 @@ PHP_FUNCTION(range)
 		}
 
 	} else if (Z_TYPE_P(zlow) == IS_DOUBLE || Z_TYPE_P(zhigh) == IS_DOUBLE || is_step_double) {
-		double low, high;
+		double low, high, value;
+		long i;
 double_str:
 		convert_to_double(zlow);
 		convert_to_double(zhigh);
 		low = Z_DVAL_P(zlow);
 		high = Z_DVAL_P(zhigh);
+		i = 0;
 
 		if (low > high) { 		/* Negative steps */
 			if (low - high < step || step <= 0) {
 				err = 1;
 				goto err;
 			}
-			for (; low >= (high - DOUBLE_DRIFT_FIX); low -= step) {
-				add_next_index_double(return_value, low);
+
+			for (value = low; value >= (high - DOUBLE_DRIFT_FIX); value = low - (++i * step)) {
+				add_next_index_double(return_value, value);
 			}
 		} else if (high > low) { 	/* Positive steps */
 			if (high - low < step || step <= 0) {
 				err = 1;
 				goto err;
 			}
-			for (; low <= (high + DOUBLE_DRIFT_FIX); low += step) {
-				add_next_index_double(return_value, low);
+
+			for (value = low; value <= (high + DOUBLE_DRIFT_FIX); value = low + (++i * step)) {
+				add_next_index_double(return_value, value);
 			}
 		} else {
 			add_next_index_double(return_value, low);

ext/standard/tests/array/bug54459.phpt

@@ -0,0 +1,215 @@
+--TEST--
+Bug #54459 (Range function accuracy)
+--INI--
+precision=14
+--FILE--
+<?php
+foreach (range(90, 100, .1) as $i => $v){
+  echo $i, ' = ', $v, PHP_EOL;
+}
+foreach (range("90", "100", .1) as $i => $v){
+  echo $i, ' = ', $v, PHP_EOL;
+}
+--EXPECT--
+0 = 90
+1 = 90.1
+2 = 90.2
+3 = 90.3
+4 = 90.4
+5 = 90.5
+6 = 90.6
+7 = 90.7
+8 = 90.8
+9 = 90.9
+10 = 91
+11 = 91.1
+12 = 91.2
+13 = 91.3
+14 = 91.4
+15 = 91.5
+16 = 91.6
+17 = 91.7
+18 = 91.8
+19 = 91.9
+20 = 92
+21 = 92.1
+22 = 92.2
+23 = 92.3
+24 = 92.4
+25 = 92.5
+26 = 92.6
+27 = 92.7
+28 = 92.8
+29 = 92.9
+30 = 93
+31 = 93.1
+32 = 93.2
+33 = 93.3
+34 = 93.4
+35 = 93.5
+36 = 93.6
+37 = 93.7
+38 = 93.8
+39 = 93.9
+40 = 94
+41 = 94.1
+42 = 94.2
+43 = 94.3
+44 = 94.4
+45 = 94.5
+46 = 94.6
+47 = 94.7
+48 = 94.8
+49 = 94.9
+50 = 95
+51 = 95.1
+52 = 95.2
+53 = 95.3
+54 = 95.4
+55 = 95.5
+56 = 95.6
+57 = 95.7
+58 = 95.8
+59 = 95.9
+60 = 96
+61 = 96.1
+62 = 96.2
+63 = 96.3
+64 = 96.4
+65 = 96.5
+66 = 96.6
+67 = 96.7
+68 = 96.8
+69 = 96.9
+70 = 97
+71 = 97.1
+72 = 97.2
+73 = 97.3
+74 = 97.4
+75 = 97.5
+76 = 97.6
+77 = 97.7
+78 = 97.8
+79 = 97.9
+80 = 98
+81 = 98.1
+82 = 98.2
+83 = 98.3
+84 = 98.4
+85 = 98.5
+86 = 98.6
+87 = 98.7
+88 = 98.8
+89 = 98.9
+90 = 99
+91 = 99.1
+92 = 99.2
+93 = 99.3
+94 = 99.4
+95 = 99.5
+96 = 99.6
+97 = 99.7
+98 = 99.8
+99 = 99.9
+100 = 100
+0 = 90
+1 = 90.1
+2 = 90.2
+3 = 90.3
+4 = 90.4
+5 = 90.5
+6 = 90.6
+7 = 90.7
+8 = 90.8
+9 = 90.9
+10 = 91
+11 = 91.1
+12 = 91.2
+13 = 91.3
+14 = 91.4
+15 = 91.5
+16 = 91.6
+17 = 91.7
+18 = 91.8
+19 = 91.9
+20 = 92
+21 = 92.1
+22 = 92.2
+23 = 92.3
+24 = 92.4
+25 = 92.5
+26 = 92.6
+27 = 92.7
+28 = 92.8
+29 = 92.9
+30 = 93
+31 = 93.1
+32 = 93.2
+33 = 93.3
+34 = 93.4
+35 = 93.5
+36 = 93.6
+37 = 93.7
+38 = 93.8
+39 = 93.9
+40 = 94
+41 = 94.1
+42 = 94.2
+43 = 94.3
+44 = 94.4
+45 = 94.5
+46 = 94.6
+47 = 94.7
+48 = 94.8
+49 = 94.9
+50 = 95
+51 = 95.1
+52 = 95.2
+53 = 95.3
+54 = 95.4
+55 = 95.5
+56 = 95.6
+57 = 95.7
+58 = 95.8
+59 = 95.9
+60 = 96
+61 = 96.1
+62 = 96.2
+63 = 96.3
+64 = 96.4
+65 = 96.5
+66 = 96.6
+67 = 96.7
+68 = 96.8
+69 = 96.9
+70 = 97
+71 = 97.1
+72 = 97.2
+73 = 97.3
+74 = 97.4
+75 = 97.5
+76 = 97.6
+77 = 97.7
+78 = 97.8
+79 = 97.9
+80 = 98
+81 = 98.1
+82 = 98.2
+83 = 98.3
+84 = 98.4
+85 = 98.5
+86 = 98.6
+87 = 98.7
+88 = 98.8
+89 = 98.9
+90 = 99
+91 = 99.1
+92 = 99.2
+93 = 99.3
+94 = 99.4
+95 = 99.5
+96 = 99.6
+97 = 99.7
+98 = 99.8
+99 = 99.9
+100 = 100