PHP recursive, static variable, anonymous function use

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 Static variable statistic number code 
 

<?php//create the array.//array structs//studentid = > ["name" = = "Name" "," grade "+ xx.x]; $students = [[' Name ' = ' Jon ', ' grade ' = ' 98.5 '], 2 = [' name ' = ' + ' Va nCE ', ' grade ' = ' 85.1 '], 9 = [' Name ' = ' Stephen ', ' grade ' = ' 94.0 '], 364 = [' name ' = ' Steve ' , ' grade ' = ' 85.1 ', [' name ' + ' Rob ', ' grade ' = ' 74.6 '],];function name_sort ($x, $y) {static $    Count = 1;    echo "<p>iteration $count: {$x [' name ']} vs. {$y [' name ']} </p>\n";    $count + +; return strcasecmp ($x [' name '], $y [' name ']);}    function Grade_sort ($x, $y) {static $count = 1;    echo "<p>iteration $count: {$x [' Grade ']} vs. {$y [' Grade ']}</p>\n ';    $count + +; return $x [' Grade '] < $y [' Grade '];} Echo Print_r ($students, 1); Uasort ($students, ' name_sort '); Hold key and use custom sort echo print_r ($students, 1); Uasort ($students, ' grade_sort '); Echo Print_r ($students, 1);? 
anonymous function--closure code

<?php//Create the array.//array structs//studentid = > ["name" = "name", "Grade" + xx.x]; $students = [
  256 = [' name ' = ' Jon ', ' grade ' = ' 98.5 '],    2 = [' name ' = ' Vance ', ' grade ' = ' 85.1 '],    9 =& Gt [' Name ' = ' Stephen ', ' grade ' = ' 94.0 '],    364 = [' name ' = ' Steve ', ' grade ' = ' 85.1 '],    [ ' Name ' = ' Rob ', ' grade ' = ' 74.6 '],];echo print_r ($students, 1); Uasort ($students, function ($x, $y) {    return STRCASECMP ($x [' name '], $y [' name '];}); Hold key and use custom sort echo print_r ($students, 1); Uasort ($students, function ($x, $y) {    return $x [' Grade '] < $y [' Grade '];}); Echo Print_r ($students, 1);? >
Reference to the parameter, when the data is a big data when used, there is no need to copy the data copy of the code

<?phpfunction Increment (& $i) {    $i + +;} $num = 2;increment ($num); Echo $num;? >
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