3v4l.org

run code in 300+ PHP versions simultaneously
<?php #### Option 1: Restricted type values // booleans $a = false; ++$a; // bool(true) ++$a; // bool(true) $a = true; --$a; // bool(false) --$a; // bool(false) // null values $a = null; --$a; // null $a = null; ++$a; // null // empty strings $a = ''; ++$a; // int(1) #### Option 2: Integer values // booleans $a = false; ++$a; // bool(true) ++$a; // int(2) $a = true; --$a; // bool(false) --$a; // int(-1) // null values $a = null; --$a; echo $a; // int(-1) $a = null; ++$a; echo $a; // int(1) #### non-numeric strings $a = '12d9'; ++$a; // string(4) "12e0" + Notice: String increment is deprecated, use str_inc() instead in php shell code on line 1 echo $a; ++$a; // float(13) echo $a;
Output for 8.3.0 - 8.3.4
Warning: Increment on type bool has no effect, this will change in the next major version of PHP in /in/uvuSS on line 7 Warning: Increment on type bool has no effect, this will change in the next major version of PHP in /in/uvuSS on line 8 Warning: Decrement on type bool has no effect, this will change in the next major version of PHP in /in/uvuSS on line 10 Warning: Decrement on type bool has no effect, this will change in the next major version of PHP in /in/uvuSS on line 11 Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/uvuSS on line 14 Deprecated: Increment on non-alphanumeric string is deprecated in /in/uvuSS on line 18 Warning: Increment on type bool has no effect, this will change in the next major version of PHP in /in/uvuSS on line 24 Warning: Increment on type bool has no effect, this will change in the next major version of PHP in /in/uvuSS on line 25 Warning: Decrement on type bool has no effect, this will change in the next major version of PHP in /in/uvuSS on line 27 Warning: Decrement on type bool has no effect, this will change in the next major version of PHP in /in/uvuSS on line 28 Warning: Decrement on type null has no effect, this will change in the next major version of PHP in /in/uvuSS on line 31 112e013
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17
112e013

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258.56 ms | 405 KiB | 354 Q