The zendump extension for PHP currently only supported on 64 bit PHP 7.0 and above.

1. Dump variable's value, use the zendump() function just like var_dump():

<?php
$n = 10;
$d = 3.14159265;
$s = 'Hello, zendump!';
zendump($n, $d, $s);

2. Use the zendump_vars() function to dump the local variables declared in the calling function's scope:

<?php
function func01($a, &$b) {
    $c = true;
    $d = 123;
    zendump_vars();
}
func01([1, 2], 'hello');

3. Use the zendump_statics() function to dump the static variables declared in the calling function's scope:

<?php
function func02() {
    static $a = 0;
    echo $a++;
    zendump_statics();
}
func02();

4. Use the zendump_opcodes() function to dump the opcodes of the calling function:

<?php
function func03($a, &$b) {
    zendump_opcodes();
    $b += $a;
    return $b;
}
func03(1, 2);

5. Use the zendump_function() function to view an internal function's basic information or dump the opcodes of a user defined function:

<?php
function func04(&$a, $b) {
    $a += $b;
    return $a;
}
zendump_function('array_merge');
zendump_function('func04');

6. Use the zendump_class() function to view the basic information of the given class specified by the name:

<?php
class SimpleClass {
    private $props = [];
    public __get($name) {
        if(isset($this->props[$name])) {
            return $this->props[$name];
        }
        return null;
    }
    public __set($name, $value) {
        $this->props[$name] = $value;
    }
}
zendump_class('ArrayAccess');
zendump_class('SimpleClass');

7. Use the zendump_method() function to view the information of a class method:

<?php
class SecondClass {
    public greeting() {
        echo 'Hello, zendump!' . PHP_EOL;
    }
}
zendump_method('SecondClass', 'greeting');

8. Some other functions like zendump_args(), zendump_literals() and zendump_symbols() if you interest in.