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How to define an array in php?
How to define arrays in PHP:
1. PHP defines the format of arrays:
array name=array();
For example: $aa=array();//This defines an array,
then assigns a value to the element:
$aa[0]="9016"; $aa[1]="9017"; $aa[2]="9018";
2. How to output an array in PHP:
foreach($aa as $val) { echo$val; }
You can also assign values directly when defining the array
$aa=array(0=>"9016",1=>"9017";2=>"9018");
3. PHP arrays can also be subscripted with characters, not necessarily numbers:
$aa["name"]="Joan"; $aa["num"]="9018"; $aa["email"]="abc@abc.com";
can also be done like this
$aa=array("name"=>"joan","num"=>"9018","email"=>"abc@abc.com");
Define the elements of a one-dimensional array as an array, which is a two-dimensional array.
$aa=array(0=>"a1",1=>"a2"); $bb=array(0=>"b1",1=>"b2"); $cc=array(0=>$aa;1=>$bb);
At this time, $cc[0] is also an array, and $cc[1] is also an array. Array, $cc is a two-dimensional array.
Similarly, three-dimensional and four-dimensional arrays can also continue to be defined.
4. The elements of the array are not only numbers and strings, but also objects of classes.
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