Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Print to standard output in different scripting languages
Answer:
To print a string of "Hello World" to the standard output in different scripting languages
1. Perl
print "Hello, World!";
2. Python
print('Hello, World!')
3. PHP
echo "Hello, World!";
4. Ruby
puts "Hello, World!"
How to remove object from array inside foreach loop?
Answer:
In PHP, to remove object (e.g. with the key = foo in the following example) from array inside foreach loop, you can try:
<?php
foreach($array as $key=> $value) {
if ($key == "foo") {
unset($array[$key]);
}
}Validate IP address in PHP
Answer:
If you are using PHP 5.2 or above (in fact, at the moment of writing, you should use at least PHP 5.3+), you can use the following easy method:
if(filter_var($ip, FILTER_VALIDATE_IP))
{
// Valid IP
}
else
{
// Invalid IP
}Get the current PHP include path's setting
Answer:
To get the current PHP include path's setting, you can use the function get_include_path
E.g.
echo get_include_path();Usually it is used with the set_include_path for adding extra path to the existing include_path,
E.g.
set_include_path(get_include_path() . PATH_SEPARATOR . "/data/path");Check the amount of memory used by PHP
Answer:
To check the amount of memory used by PHP process, use the function - memory_get_usage
E.g.
// Returns the amount of memory, in bytes, that's currently being allocated to your PHP script.
echo memory_get_usage(); 
