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<?php $tests=[1=>1,'string 0'=>'0','null'=>null,'false'=>false,'integer 0'=>0,'foo'=>'foo']; foreach($tests as $name=>$test){ if( isset($test) && ($test != "") ){ var_export("$name: pass != \"\""); }else{ var_export("$name: fail != \"\""); } echo "\n"; if( isset($test) && ($test !== '') ){ var_export("$name: pass !== \"\""); }else{ var_export("$name: fail !== \"\""); } echo "\n"; if(!empty($test) ){ var_export("$name: pass !empty"); }else{ var_export("$name: fail !empty"); } echo "\n\n"; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
'1: pass != ""' '1: pass !== ""' '1: pass !empty' 'string 0: pass != ""' 'string 0: pass !== ""' 'string 0: fail !empty' 'null: fail != ""' 'null: fail !== ""' 'null: fail !empty' 'false: fail != ""' 'false: pass !== ""' 'false: fail !empty' 'integer 0: pass != ""' 'integer 0: pass !== ""' 'integer 0: fail !empty' 'foo: pass != ""' 'foo: pass !== ""' 'foo: pass !empty'
Output for 5.6.40, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
'1: pass != ""' '1: pass !== ""' '1: pass !empty' 'string 0: pass != ""' 'string 0: pass !== ""' 'string 0: fail !empty' 'null: fail != ""' 'null: fail !== ""' 'null: fail !empty' 'false: fail != ""' 'false: pass !== ""' 'false: fail !empty' 'integer 0: fail != ""' 'integer 0: pass !== ""' 'integer 0: fail !empty' 'foo: pass != ""' 'foo: pass !== ""' 'foo: pass !empty'
preferences:
141.02 ms | 409 KiB | 5 Q