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Test of grapheme_substr()

Example #1 : test success
Example #1
$input = [
  
=> '_DOUBLE_QUOTES_aoa\\xCC\\x8Abco\\xCC\\x88O_DOUBLE_QUOTES_',
  
=> 2,
  
=> -1,
]
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'string' => 'åbcö',
    
'encoded' => 'a%CC%8Abco%CC%88',
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]