Introduction to the steps of PHP traversing associative arrays

Introduction to how PHP iterates through associative arrays

In PHP, arrays are divided into two categories: numeric indexed arrays and associative arrays. Where the numeric index array is the same as the array in the C language, the subscript is for 0,1,2 ... Associative array subscripts may be of any type, similar to Hash,map in other languages.

Here are three ways to traverse associative arrays in PHP:

Foreach

 
  ' Good ',    ' swimming ' = ' very well ',    ' running '  = ' not good '); foreach ($sports as $key + $value) {
  echo $key. ":". $value. "
";}? >

Program Run Result:

Football:goodswimming:very Wellrunning:not Good

each

 
  ' Good ',    ' swimming ' = ' very well ', ' running ' and ' not  good '); and ($elem = each ($sports)) {    echo $ elem[' key ']. ":". $elem [' value ']. "
";}? >

program Run Result: program run Result:

Football:goodswimming:very Wellrunning:not Good

List & each

 
  ' Good ',    ' swimming ' = ' very well ', ' running ' and ' not  good '); while (List ($key, $value) = each ($ Sports) {    echo $key. ":" $value. "
";}? >

Program Run Result:

Football:goodswimming:very Wellrunning:not Good

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