add_unit.php

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <title> add_unit.php </title>
  <meta charset="UTF-8">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
 </head>

 <body>

<?php
//头部插入
$a = array("1", "2");
print_r($a);
echo "<hr>";
array_unshift($a, "3", "4");
print_r($a);
echo "<hr>";
//尾部插入
$b = array("banana");
print_r($b);
echo "<hr>";
array_push($b, "apple", "raspberry");
print_r($b);
echo "<hr>";
?>
 </body>
</html>


Array ( [0] => 1 [1] => 2 )
Array ( [0] => 3 [1] => 4 [2] => 1 [3] => 2 )
Array ( [0] => banana )
Array ( [0] => banana [1] => apple [2] => raspberry )


0 0