Display the drop-down list

Test of is_string()

Example #1 : test success
Example #2 : test success
Example #3 : test success
Example #4 : test success
Example #5 : test success
Example #6 : test success
Example #7 : test success
Example #8 : test success
Example #9 : test success
Example #10 : test success
Example #11 : test success
Example #12 : test success
Example #1
$input = false
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => false,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #2
$input = true
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => false,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #3
$input = NULL
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => false,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #4
$input = 'abc'
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => true,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #5
$input = '23'
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => true,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #6
$input = 23
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => false,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #7
$input = '23.5'
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => true,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #8
$input = 23.5
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => false,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #9
$input = ''
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => true,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #10
$input = ' '
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => true,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #11
$input = '0'
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => true,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]
Example #12
$input = 0
$expected_output = $test_output
$test_output = [
  
'result' => [
    
'bool' => false,
  ],
  
'php_version' => '7.1.30 Linux x86_64',
]