3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array('a', 'b'); foreach ($arr as &$a) { var_dump($a); } debug_zval_dump($arr); debug_zval_dump($a); foreach ($arr as $a) { var_dump($a); } debug_zval_dump($arr); debug_zval_dump($a);
Output for 8.4.1 - 8.4.14, 8.4.16 - 8.4.17, 8.5.0 - 8.5.2
string(1) "a" string(1) "b" array(2) packed refcount(2){ [0]=> reference refcount(1) { string(1) "a" interned } [1]=> reference refcount(2) { string(1) "b" interned } } string(1) "b" interned string(1) "a" string(1) "a" array(2) packed refcount(2){ [0]=> reference refcount(1) { string(1) "a" interned } [1]=> reference refcount(2) { string(1) "a" interned } } string(1) "a" interned
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30
string(1) "a" string(1) "b" array(2) refcount(2){ [0]=> reference refcount(1) { string(1) "a" interned } [1]=> reference refcount(2) { string(1) "b" interned } } string(1) "b" interned string(1) "a" string(1) "a" array(2) refcount(2){ [0]=> reference refcount(1) { string(1) "a" interned } [1]=> reference refcount(2) { string(1) "a" interned } } string(1) "a" interned
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
string(1) "a" string(1) "b" array(2) refcount(2){ [0]=> string(1) "a" refcount(1) [1]=> &string(1) "b" refcount(1) } string(1) "b" refcount(1) string(1) "a" string(1) "a" array(2) refcount(2){ [0]=> string(1) "a" refcount(1) [1]=> &string(1) "a" refcount(1) } string(1) "a" refcount(1)
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33
string(1) "a" string(1) "b" array(2) refcount(2){ [0]=> string(1) "a" refcount(2) [1]=> &string(1) "b" refcount(2) } string(1) "b" refcount(3) string(1) "a" string(1) "a" array(2) refcount(2){ [0]=> string(1) "a" refcount(3) [1]=> &string(1) "a" refcount(3) } string(1) "a" refcount(4)
Output for 5.2.1 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
string(1) "a" string(1) "b" array(2) refcount(2){ [0]=> string(1) "a" refcount(1) [1]=> &string(1) "b" refcount(2) } string(1) "b" refcount(1) string(1) "a" string(1) "a" array(2) refcount(2){ [0]=> string(1) "a" refcount(1) [1]=> &string(1) "a" refcount(2) } string(1) "a" refcount(1)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0
string(1) "a" string(1) "b" array(2) refcount(2){ [0]=> &string(1) "a" refcount(1) [1]=> &string(1) "b" refcount(2) } string(1) "b" refcount(1) string(1) "a" string(1) "a" array(2) refcount(2){ [0]=> string(1) "a" refcount(1) [1]=> &string(1) "a" refcount(2) } string(1) "a" refcount(1)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/Reth9 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/Reth9 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/Reth9 on line 4
Process exited with code 255.
preferences:
155.75 ms | 420 KiB | 5 Q