Installation of PHP


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Float

Home  >> Data Types   >> Float Float Floating point numbers (also known as "floats", "doubles", or "real numbers") can be specified using any of the following syntaxes: <?php $a  =  1.234 ;  $b  =  1.2e3 ;  $c  =  7E-10 ; ?> Formally LNUM          [0-9]+ DNUM          ([0-9]*[\.]{LNUM}) | ({LNUM}[\.][0-9]*) EXPONENT_DNUM [+-]?(({LNUM} | {DNUM}) [eE][+-]? {LNUM}) The size of a float is platform-dependent, although a maximum of ~1.8e308 with a precision of roughly 14 decimal digits is a common value (the 64 bit IEEE format). Floating point precision Floating point numbers have limited precision. Although it depends on the system, PHP typically uses the IEEE 754 double precision format, which will give a maximum relative error due to rounding in the order of 1.11e-16. Non elementary arithmetic ...
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FastCGI Process Manager

Home  >> Installation of PHP  >>FastCGI Process Manager FastCGI Process Manager: FPM (FastCGI Process Manager) is another method of installing PHP with extra features. It is mostly useful for heavy-loaded sites.  The important features are:  advanced process management with graceful stop/start;  ability to start workers with different uid/gid/chroot/environment, listening on different ports and using different php.ini (replaces safe_mode);  stdout and stderr logging;  emergency restart in case of accidental opcode cache destruction;  accelerated upload support; "slowlog" - logging scripts (not just their names, but their PHP backtraces too, using ptrace and similar things to read remote process' execute_data) that are executed unusually slow; fastcgi_finish_request() - special function to finish request and flush all data while continuing to do something time-consuming (video converting, stats processing etc.); ...
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Boolean Type

Home  >> Data Types   >> Boolean The boolean type returns the value either TRUE or FALSE Syntax In order to specify the boolean variable, use the constants TRUE or FALSE. Both are case-insensitive <?php $coderz  =  True ;  // assign the value TRUE to $coderz ?> Typically, the   control structure depends upon the value of boolean operator. Because, it returns either TRUE or FALSE <?php // == is an operator which tests // equality and returns a boolean if ( $name ==  "coderz" ) {     echo  "Coderztoday is the best online tutorial" ; } // this is not necessary... if ( $name ==TRUE) {     echo  "<hr>\n" ; } // ...because this can be used with exactly the...
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