PHP array functions (2)

conversion functions between arrays and variables

1. List () language structure

• • Format: void list (mixed varname1[,mixed varname2[,mixed ...]) = array arr, assigning a set of variables in one step.
    • Note: the list () language structure is used only for arrays of numeric "keys" and requires the number "key" to increment continuously from 0;

2. Extract () function

• • Format: int extract (array arr), use an array of arr to define a set of variables, where the variable name is the key name of the ARR element, and the variable value is the value of the array arr element "key".

3. Compact () function

• • Format: Array compact (mixed varname1[,mixed varname2[,mixed ...]), returns an array of "keys" for each element named variable name varname1 (varname2 ...), each of the array elements " Value "is Variable varname1 (varname2 ...) The value.

Array Traversal language structure

1. foreach (array as $value)
2. foreach (array as $key = = $value)

For example:

<?PHP$interests[2] = "Music";$interests[6] = "movie";$interests[1] = "Computer";$interests[] = "Software";foreach($interests  as $value) {    Echo $value." <br> ";}foreach($interests  as $key=$value) {    Echo $key. "=".$value. "<br>" ;}?>

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PHP array functions (2)