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7 
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 some pseudo-types (mixed)  
<?php
// 1. mixed
// gettype() for example will accept all PHP types

$data = array(1, 1., NULL, new stdClass, 'foo');

foreach ($data as $value) {
    echo gettype($value), "<br>";
}
echo "<br>";

// str_replace() will accept strings and arrays. 

// Provides: <body text='black'>
$bodytag = str_replace("%body%", "black", "body text='%body%'>");

echo $bodytag . "<br><br>";

// Provides: Hll Wrld f PHP
$vowels = array("a", "e", "i", "o", "u", "A", "E", "I", "O", "U");
$onlyconsonants = str_replace($vowels, "", "Hello World of PHP");
print_r($onlyconsonants); echo "<br><br>";

// Provides: You should eat pizza, beer, and ice cream every day
$phrase  = "You should eat fruits, vegetables, and fiber every day.";
$healthy = array("fruits", "vegetables", "fiber");
$yummy   = array("pizza", "meat", "ice cream");

$newphrase = str_replace($healthy, $yummy, $phrase);
print($newphrase);
 		 integer
double
NULL
object
string

body text='black'>

Hll Wrld f PHP

You should eat pizza, meat, and ice cream every day.  		   
8 
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 some pseudo-types for readability reasons  
<?php 

/***
// 2. number
number:

number indicates that a parameter can be either integer or float. 

// 3. callback functions:
callback:

Some functions like call_user_func() or usort() accept user-defined 
callback functions as a parameter. Callback functions can not only be 
simple functions, but also object methods, including static class 
methods. 

***/
 		   http://www.php.net/manual/en/language.pseudo-types   
9 
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 type check  
<?php
$a_bool = TRUE;   // a boolean
$a_str  = "foo";  // a string
$a_str2 = 'foo';  // a string
$an_int = 12;     // an integer

echo gettype($a_bool) . "<br>"; // prints out:  boolean
echo gettype($a_str) . "<br>";  // prints out:  string

// If this is an integer, increment it by four
if (is_int($an_int)) {
    $an_int += 4;
    echo $an_int;
}

// If $a_bool is a string, print it out
// (does not print out anything)
if (is_string($a_bool)) {
    echo "String: $a_bool";
}
 		 boolean
string
16  		   
10 
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 boolean  
<?php
var_dump((bool) "");        // bool(false)
var_dump((bool) 1);         // bool(true)
var_dump((bool) -2);        // bool(true)
var_dump((bool) "foo");     // bool(true)
var_dump((bool) 2.3e5);     // bool(true)
var_dump((bool) array(12)); // bool(true)
var_dump((bool) array());   // bool(false)
var_dump((bool) "false");   // bool(true)
 		 bool(false) bool(true) bool(true) bool(true) bool(true) bool(true) bool(false) bool(true)   http://www.php.net/manual/en/language.types.boolean.php   
11 
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 integers  
<?php
$a = 1234; // decimal number
$a = -123; // a negative number
$a = 0123; // octal number (equivalent to 83 decimal)
$a = 0x1A; // hexadecimal number (equivalent to 26 decimal)

// converting a float value to integer:
$aFloat = 3.14159;

echo intval($aFloat);
 		 3  http://www.php.net/manual/en/language.types.integer.php   

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