set flag to false, to allow 0's in lower periods determine if temp qualifies to be passed to output $temp = floor ( $int_seconds / $length )
PHP_INT_MAX % (PHP_INT_MAX - 1) = 1 (correct) Here are a few problems with fmod() and their alternatives.įmod(PHP_INT_MAX, PHP_INT_MAX - 1) = 0 (wrong)įmod_alt(PHP_INT_MAX, PHP_INT_MAX - 1) = 1 (correct)įmod_alt(PHP_INT_MAX, PHP_INT_MAX - 1.0) = 0 (wrong) For large values or depending on your input variable types, float still may not contain enough precision to get back the correct answer. WARNING: Even when you get a non-zero response, know your input numbers and when fmod() can go wrong. This is the "best" alternative for fmod() when given "normal" numbers. If your $x and $y values are so different that it suffers from an overflow problem when casting, it was probably going to have precision problems anyway (see warnings below). Dynamically choosing floor or ceil in an attempt to keep precision is overkill. This causes a commonly proposed fmod() alternative to only work with positive numbers:Ĭorrectly removing the decimal part of the quotient can be achieved with either casting to an int (always goes towards zero) or dynamically choosing ceil() or floor(). When working around fmod()'s problems, remember that floor() always goes towards -INF, not 0. If you need to work with large numbers or arbitrary precision, it is best to work with something like BC Math or GMP. WARNING: Due to how floating point numbers work, fmod() and any simple alternatives are problematic when there is either a massive orders of magnitude different between the input $x and $y, or the input and output values.
#Mathmod manual archive#
Typeset mathematics contained inline (within) with the text of a paragraph needs to take less space than the same math typeset outside the paragraph text as standalone, display-style, material.Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search
#Mathmod manual how to#
This article explains how to manually adjust the style of typeset mathematics-but we’ll start with a quick reminder of the visible differences between inline and display style math. 2 Overriding default mathematical styles.
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