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class.vartype-arithmetic.php
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class.vartype-arithmetic.php
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<?php
/**
* Variable Arithmetic tests.
*
* @package PHPCheatsheets
*/
// Prevent direct calls to this file.
if ( ! defined( 'APP_DIR' ) ) {
header( 'Status: 403 Forbidden' );
header( 'HTTP/1.1 403 Forbidden' );
exit();
}
require_once APP_DIR . '/class.vartype-compare.php';
/**
* Variable Arithmetic tests.
*/
class VartypeArithmetic extends VartypeCompare {
/**
* The tests to run.
*
* @var array $tests Multi-dimensional array.
* Possible lower level array keys:
* - title Used as tab title
* - tooltip Additional code sample for tooltip on tab
* - url Relevant PHP Manual page
* - arg Function arguments
* - function Function to run
* - Notes Array of notes on this test
*/
var $tests = array(
/**
* Operator based calculations.
*/
'negate' => array(
'title' => 'negate…',
'tooltip' => '$a == -$b',
'url' => 'https://php.net/language.operators.arithmetic',
'arg' => '$a, $b',
'function' => 'if ( ( ! is_array( $a ) && ! is_array( $b ) ) && ( ! is_object( $a ) && ! is_object( $b ) ) ) { pr_bool( $a == -$b ); } else if ( PHP_VERSION_ID >= 50006 && ( ! is_array( $a ) && ! is_array( $b ) ) && ( is_object( $a ) || is_object( $b ) ) ) { pr_bool( $a == -$b ); } else { trigger_error( \'Unsupported operand types\', E_USER_ERROR ); }',
),
'negate_strict' => array(
'title' => 'negate strict…',
'tooltip' => '$a === -$b',
'url' => 'https://php.net/language.operators.arithmetic',
'arg' => '$a, $b',
'function' => 'if ( ( ! is_array( $a ) && ! is_array( $b ) ) && ( ! is_object( $a ) && ! is_object( $b ) ) ) { pr_bool( $a === -$b ); } else if ( PHP_VERSION_ID >= 50006 && ( ! is_array( $a ) && ! is_array( $b ) ) && ( is_object( $a ) || is_object( $b ) ) ) { pr_bool( $a === -$b ); } else { trigger_error( \'Unsupported operand types\', E_USER_ERROR ); }',
),
'sum' => array(
'title' => '+',
'tooltip' => '$a + $b',
'url' => 'https://php.net/language.operators.arithmetic',
'arg' => '$a, $b',
'function' => 'if ( ( ( ! is_array( $a ) && ! is_array( $b ) || ( is_array( $a ) && is_array( $b ) ) ) ) && ( ! is_object( $a ) && ! is_object( $b ) ) ) { pr_var( $a + $b, \'\', true, true ); } else if ( PHP_VERSION_ID >= 50006 && ( ! is_array( $a ) && ! is_array( $b ) ) && ( is_object( $a ) || is_object( $b ) ) ) { pr_var( $a + $b, \'\', true, true ); } else { trigger_error( \'Unsupported operand types\', E_USER_ERROR ); }',
'notes' => array(
'<p>Take note of the fact that <code> + </code> is a valid <a href="https://php.net/language.operators.array" target="_blank">array operator</a>.</p>',
),
),
'subtract' => array(
'title' => '-',
'tooltip' => '$a - $b',
'url' => 'https://php.net/language.operators.arithmetic',
'arg' => '$a, $b',
'function' => 'if ( ( ! is_array( $a ) && ! is_array( $b ) ) && ( ! is_object( $a ) && ! is_object( $b ) ) ) { pr_var( $a - $b, \'\', true, true ); } else if ( PHP_VERSION_ID >= 50006 && ( ! is_array( $a ) && ! is_array( $b ) ) && ( is_object( $a ) || is_object( $b ) ) ) { pr_var( $a - $b, \'\', true, true ); } else { trigger_error( \'Unsupported operand types\', E_USER_ERROR ); }',
),
'multiply' => array(
'title' => '*',
'tooltip' => '$a * $b',
'url' => 'https://php.net/language.operators.arithmetic',
'arg' => '$a, $b',
'function' => 'if ( ( ! is_array( $a ) && ! is_array( $b ) ) && ( ! is_object( $a ) && ! is_object( $b ) ) ) { pr_var( $a * $b, \'\', true, true ); } else if ( PHP_VERSION_ID >= 50006 && ( ! is_array( $a ) && ! is_array( $b ) ) && ( is_object( $a ) || is_object( $b ) ) ) { pr_var( $a * $b, \'\', true, true ); } else { trigger_error( \'Unsupported operand types\', E_USER_ERROR ); }',
),
'divide' => array(
'title' => '/',
'tooltip' => '$a / $b',
'url' => 'https://php.net/language.operators.arithmetic',
'arg' => '$a, $b',
'function' => 'if ( ( ! is_array( $a ) && ! is_array( $b ) ) && ( ! is_object( $a ) && ! is_object( $b ) ) ) { $r = $a / $b; if ( is_bool( $r ) ) { pr_bool( $r ); } else { pr_var( $r, \'\', true, true ); } } else if ( PHP_VERSION_ID >= 50006 && ( ! is_array( $a ) && ! is_array( $b ) ) && ( is_object( $a ) || is_object( $b ) ) ) { $r = $a / $b; if ( is_bool( $r ) ) { pr_bool( $r ); } else { pr_var( $r, \'\', true, true ); } } else { trigger_error( \'Unsupported operand types\', E_USER_ERROR ); }',
),
'modulus' => array(
'title' => '%',
'tooltip' => '$a % $b',
'url' => 'https://php.net/language.operators.arithmetic',
'arg' => '$a, $b',
'function' => '$r = $a % $b; if ( is_bool( $r ) ) { pr_bool( $r ); } else { pr_var( $r, \'\', true, true ); }',
'notes' => array(
'<p>Pre-PHP 7, a "<em>Division by zero</em>" error would be emitted as a warning. From PHP 7 onwards, this has been changed to a catchable fatal error.</p>',
),
),
// Will be removed from $tests property from constructor if not on PHP 5.6+ to prevent parse errors.
'pow_operator' => array(
'title' => '**',
'url' => 'https://php.net/language.operators.arithmetic',
'arg' => '$a, $b',
'function' => 'if ( PHP_VERSION_ID >= 50600 ) { pr_var( $a ** $b, \'\', true, true ); } else { print \'E: \'**\' operator not available (PHP 5.6+)\'; }',
'notes' => array(
'<p>This operator is only available in PHP 5.6.0+.</p>',
),
),
// Doesn't really belong in arithmetic, but for now it's the most logical place anyhow.
'concatenate' => array(
'title' => '.',
'tooltip' => '$a . $b',
'url' => 'https://php.net/language.operators.string.php',
'arg' => '$a, $b',
'function' => 'pr_var( $a . $b, \'\', true, true );',
),
'fmod' => array(
'title' => 'fmod()',
'url' => 'https://php.net/fmod',
'arg' => '$a, $b',
'function' => 'if ( function_exists( \'fmod\' ) ) { pr_var( fmod( $a, $b ), \'\', true, true ); } else { print \'E: not available (PHP 4.2.0+)\'; }',
),
'pow' => array(
'title' => 'pow()',
'url' => 'https://php.net/pow',
'arg' => '$a, $b',
'function' => 'pr_var( pow( $a, $b ), \'\', true, true );',
),
'intdiv' => array(
'title' => 'intdiv()',
'url' => 'https://php.net/intdiv',
'arg' => '$a, $b',
'function' => 'if ( function_exists( \'intdiv\' ) ) { pr_var( intdiv( $a, $b ), \'\', true, true ); } else { print \'E: not available (PHP 7.0.0+)\'; }',
'notes' => array(
'<p>The <em>intdiv()</em> function is only available in PHP 7.0.0+.</p>',
),
),
);
/**
* Calculations with BCMath.
*
* Will be added to $tests property from constructor if BCMath is available.
*
* @var array $bcmath_tests Multi-dimensional array of BC Math related tests.
*/
var $bcmath_tests = array(
'bcadd' => array(
'title' => 'bcadd()',
'url' => 'https://php.net/bcadd',
'arg' => '$a, $b',
'function' => '$r = bcadd( $a, $b ); if ( is_string( $r ) ) { pr_str( $r ); } else { pr_var ( $r, \'\', true, true ); }',
'notes' => array(
'<p>For this cheat sheet <code>bcscale()</code> has been set to 3. Remember that the default is 0.</p>',
'<p>For a reliable implementation of all the BCMath functions which avoids a number of the common pitfalls, see <a href="https://gist.github.com/jrfnl/8449978" target="_blank">this example function</a> (gist).</p>',
),
),
'bcsub' => array(
'title' => 'bcsub()',
'url' => 'https://php.net/bcsub',
'arg' => '$a, $b',
'function' => '$r = bcsub( $a, $b ); if ( is_string( $r ) ) { pr_str( $r ); } else { pr_var ( $r, \'\', true, true ); }',
'notes' => array(
'<p>For this cheat sheet <code>bcscale()</code> has been set to 3. Remember that the default is 0.</p>',
'<p>For a reliable implementation of all the BCMath functions which avoids a number of the common pitfalls, see <a href="https://gist.github.com/jrfnl/8449978" target="_blank">this example function</a> (gist).</p>',
),
),
'bcmul' => array(
'title' => 'bcmul()',
'url' => 'https://php.net/bcmul',
'arg' => '$a, $b',
'function' => '$r = bcmul( $a, $b ); if ( is_string( $r ) ) { pr_str( $r ); } else { pr_var ( $r, \'\', true, true ); }',
'notes' => array(
'<p>For this cheat sheet <code>bcscale()</code> has been set to 3. Remember that the default is 0.</p>',
'<p>For a reliable implementation of all the BCMath functions which avoids a number of the common pitfalls, see <a href="https://gist.github.com/jrfnl/8449978" target="_blank">this example function</a> (gist).</p>',
),
),
'bcdiv' => array(
'title' => 'bcdiv()',
'url' => 'https://php.net/bcdiv',
'arg' => '$a, $b',
'function' => '$r = bcdiv( $a, $b ); if ( is_string( $r ) ) { pr_str( $r ); } else { pr_var ( $r, \'\', true, true ); }',
'notes' => array(
'<p>For this cheat sheet <code>bcscale()</code> has been set to 3. Remember that the default is 0.</p>',
'<p>For a reliable implementation of all the BCMath functions which avoids a number of the common pitfalls, see <a href="https://gist.github.com/jrfnl/8449978" target="_blank">this example function</a> (gist).</p>',
),
),
'bcmod' => array(
'title' => 'bcmod()',
'url' => 'https://php.net/bcmod',
'arg' => '$a, $b',
'function' => '$r = bcmod( $a, $b ); if ( is_string( $r ) ) { pr_str( $r ); } else { pr_var ( $r, \'\', true, true ); }',
'notes' => array(
'<p>For this cheat sheet <code>bcscale()</code> has been set to 3. Remember that the default is 0.</p>',
'<p>For a reliable implementation of all the BCMath functions which avoids a number of the common pitfalls, see <a href="https://gist.github.com/jrfnl/8449978" target="_blank">this example function</a> (gist).</p>',
),
),
/*
Issue #5: https://github.com/jrfnl/PHP-cheat-sheet-extended/issues/5
'bcpow' => array(
'title' => 'bcpow()',
'url' => 'https://php.net/bcpow',
'arg' => '$a, $b',
'function' => 'if ( $a != 0 && is_infinite( pow( $a, $b ) ) === false ) { $r = bcpow( $a, $b ); if ( is_string( $r ) ) { pr_str( $r ); } else { pr_var ( $r, \'\', true, true ); } } else { trigger_error( \'would result in INF and will normally exhaust memory\', E_USER_ERROR ); }',
'notes' => array(
'<p>For this cheat sheet <code>bcscale()</code> has been set to 3. Remember that the default is 0.</p>',
'<p>For a reliable implementation of all the BCMath functions which avoids a number of the common pitfalls, see <a href="https://gist.github.com/jrfnl/8449978" target="_blank">this example function</a> (gist).</p>',
),
),
*/
);
/**
* Constructor.
*/
function __construct() {
if ( PHP_VERSION_ID < 50600 ) {
unset( $this->tests['pow_operator'] );
}
if ( PHP_VERSION_ID < 70000 ) {
unset( $this->tests['intdiv'] );
}
if ( extension_loaded( 'bcmath' ) ) {
$this->tests = array_merge( $this->tests, $this->bcmath_tests );
bcscale( 3 );
}
parent::__construct();
}
/**
* PHP4 Constructor.
*/
function VartypeArithmetic() {
$this->__construct();
}
}