String after encoding and array length doubts

1. Java:
String length:

str = "abcdefg";int len = str.length(); // 7String strcn = "你好世界";int len = str.length(); // 4

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Number of arrays:

String[] arr = new String[3];int arrlen = arr.length;    // 3

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2. PHP
String length:

$str =' Hello World ';$strlen = strlen ( $STR);  $STRCN =  ' Hello World ';  $STRCN); //a Chinese is 3 string number  $strcnlen 2 = Mb_strlen (  $STRCN,  ' utf-8 '); //put a Chinese as a string number print  $strlen. //11print  $strcnlen. //12print  $strcnlen 2.//4             

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Number of arrays:

Tip:sizeof () equals count ()$arr =Array' A ',' C ',' B ' + =Array1,2), ' d ' =>array (1, 2,3)); //calculates the number of one-dimensional arrays  $arrlen = count ($ ARR); //or Count ($arr, 0) or count ($arr, count_normal) //calculates the total number of multidimensional arrays Span class= "hljs-variable" > $arrlen 1 = count ( $arr, 1); //or COUNT ($arr, count_recursive) print  $arrlen. //4print  $arrlen 1.//9             

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3. Python:
String length:

‘hello world‘strcn = ‘你好世界‘strlen = len(str)strcnlen = len(strcn)print strlen // 11print strcnlen // 12

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Number of arrays:

arr = [1,2,3,4,5]strlen = len(arr)print strlen // 5

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4, JS
String length:

var txt="Hello World"document.write(txt.length)  // 11var txt="你好世界"document.write(txt.length)  // 4

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Number of arrays:

var arr = [‘a‘, 2, ‘c‘];document.write(arr.length) // 3

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String after encoding and array length doubts