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<?php var_dump(strtoupper(1)); var_dump(strtoupper(1.2)); var_dump(strtoupper(false)); var_dump(strtoupper('a')); var_dump(strtoupper(NULL)); var_dump(strtoupper('' == '')); var_dump(strtoupper(NULL == '')); ?>
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
string(1) "1" string(3) "1.2" string(0) "" string(1) "A" Deprecated: strtoupper(): Passing null to parameter #1 ($string) of type string is deprecated in /in/gvXmr on line 7 string(0) "" string(1) "1" string(1) "1"
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30
string(1) "1" string(3) "1.2" string(0) "" string(1) "A" string(0) "" string(1) "1" string(1) "1"
preferences:
94.8 ms | 407 KiB | 5 Q