How to traverse an associative array in PHP

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

Here are three ways to traverse an associative array in PHP:

Foreach

<?php  
$sports = Array (  
    ' Football ' => ' good ', '  
    swimming ' => ' very '),  
    ' running  ' => ' Not good '
    );  
          
foreach ($sports as $key => $value) {  
    echo $key. ":". $value. " <br  /> ";  
}  
? >

Program Run Result:

Football:good  
swimming:very  
running:not Good

each

<?php  
$sports = Array (  
    ' Football ' => ' good ', '  
    swimming ' => ' very ok ',  
    ' running '  = > ' not good '
    );  
          
while ($elem = each ($sports)) {  
    echo $elem [' key ']. ":" $elem [' value ']. " <br  /> ";  
}  
? >

Program Run Result: program run Result:

Football:good  
swimming:very  
running:not Good

List & each

<?php  
$sports = Array (  
    ' Football ' => ' good ', '  
    swimming ' => ' very '),  
    ' running  ' => ' Not good '
    );  
          
while (the list ($key, $value) = each ($sports)) {  
    echo $key. ". $value." <br  /> ";  
}  
? >

Program Run Result:

Football:good  
swimming:very  
running:not Good

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