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Test of utf8_decode()

Example #1 : test success
Example #1
$input = 'à'
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'string' => '',
    
'hex' => 'e0',
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]