STEP UP BLOG

$ cd /usr/local/src/php-5.x.xx/ext/zip

$ sudo /usr/local/bin/phpize
$ sudo ./configure --with-php-config=/usr/local/bin/php-config
$ sudo make
$ sudo make test
$ sudo make install
$ sudo vi /usr/local/lib/php.ini
+ extension=zip.so
$ sudo service httpd restart
$ php -i | grep zip
Registered PHP Streams => compress.zlib, php, file, glob, data, http, ftp, zip, phar  
gzip compression => enabled
bzip2 compression => disabled (install pecl/bz2)
zip
Libzip version => 0.10.1

$ composer require psy/psysh:@stable

$ ./vendor/psy/psysh/bin/psysh 
Psy Shell v0.8.0 (PHP 7.1.0 — cli) by Justin Hileman
>>> help
  help       Show a list of commands. Type `help [foo]` for information about [foo].      Aliases: ?                     
  ls         List local, instance or class variables, methods and constants.              Aliases: list, dir             
  dump       Dump an object or primitive.                                                                                
  doc        Read the documentation for an object, class, constant, method or property.   Aliases: rtfm, man             
  show       Show the code for an object, class, constant, method or property.                                           
  wtf        Show the backtrace of the most recent exception.                             Aliases: last-exception, wtf?  
  whereami   Show where you are in the code.                                                                             
  throw-up   Throw an exception out of the Psy Shell.                                                                    
  trace      Show the current call stack.                                                                                
  buffer     Show (or clear) the contents of the code input buffer.                       Aliases: buf                   
  clear      Clear the Psy Shell screen.                                                                                 
  history    Show the Psy Shell history.                                                  Aliases: hist                  
  exit       End the current session and return to caller.                                Aliases: quit, q               
>>> 

>> $arr = [1,2,3];
=> [
     1,
     2,
     3,
   ]
>>> 1 + 2;
=> 3
>>> function square($x) {
... return $x*$x*$x;
... }
=> null
>>> square(4);
=> 64

<?php

class ClassA
{
    private $member_variable = 'A';

    public function getMemberVariable()
    {
        return $this->member_variable;
    }
}

class ClassB extends ClassA
{
    private $member_variable = 'B';

    public function getMemberVariable()
    {
        return $this->member_variable;
    }
}

class ClassC extends ClassA
{
    private $member_variable = 'C';
}

$a = new ClassA();
$b = new ClassB();
$c = new ClassC();

echo $a->getMemberVariable()."\n";
echo $b->getMemberVariable()."\n";
echo $c->getMemberVariable()."\n";

$ php test.php 
A
B
A

<?php

class ClassA
{
    protected $member_variable = 'A';

    public function getMemberVariable()
    {
        return $this->member_variable;
    }
}

class ClassB extends ClassA
{
    protected $member_variable = 'B';

    public function getMemberVariable()
    {
        return $this->member_variable;
    }
}

class ClassC extends ClassA
{
    protected $member_variable = 'C';
}

$a = new ClassA();
$b = new ClassB();
$c = new ClassC();

echo $a->getMemberVariable()."\n";
echo $b->getMemberVariable()."\n";
echo $c->getMemberVariable()."\n";

$ php test.php 
A
B
C

$ php -r "echo date('m', strtotime('+1 month'));"
05

$dt = new Carbon('next month');
echo $dt->format('m');  // 05

$dt = date('m', strtotime(date('Y-m-1').' +1 month'));
echo $dt;  // 04

$dt = new Carbon('first day of next month');
echo $dt->format('m');  // 04

$dt = new DateTime('first day of next month');
echo $dt->format('m');  // 04

指定した文字数で、指定した文字を用いて文字列を分割します。

function mb_wordwrap($string, $width, $break)
{
    $result = [];
    $tmp_str = '';
    $i = 0;
    while (mb_strlen($tmp_str) < mb_strlen($string)) {
        $str = mb_substr($string, $i*$width, $width);
        $result[] = $str;
        $tmp_str .= $str;
        $i++;
    }

    return implode($break, $result);
}