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How to get log2 e, log10 e, loge 2, log 2 10 and other Euler's constants in PHP
PHP has the constants mentioned in the title and others already predefined. All you need is the right code to access them by! Here then is a table, still in HTML code format so you can see the PHP parts;-), with all the relevant PHP variables for each of the constants: <table width="800" cellpadding="0" cellspacing="0" border="1"> <tr> <td align="center"><b>Definition</b></td> <td align="center"><b>PHP</b></td> <td align="center"><b>Value</b></td> </tr> <tr> <td align="center"><b>Pi</b></td> <td align="center">M_PI</td> <td align="center"><?php echo M_PI;?></td> </tr> <tr> <td align="center"><b>Pi/2</b></td> <td align="center">M_PI_2</td> <td align="center"><?php echo M_PI_2;?></td> </tr> <tr> <td align="center"><b>Pi/4</b></td> <td align="center">M_PI_4</td> <td align="center"><?php echo M_PI_4;?></td> </tr> <tr> <td align="center"><b>1/Pi</b></td> <td align="center">M_1_PI</td> <td align="center"><?php echo M_1_PI;?></td> </tr> <tr> <td align="center"><b>2/Pi</b></td> <td align="center">M_2_PI</td> <td align="center"><?php echo M_2_PI;?></td> </tr> <tr> <td align="center"><b>2/(Square Route of Pi)</b></td> <td align="center">M_2_SQRTPI</td> <td align="center"><?php echo M_2_SQRTPI;?></td> </tr> <tr> <td align="center"><b>e</b></td> <td align="center">M_E</td> <td align="center"><?php echo M_E;?></td> </tr> <tr> <td align="center"><b>log<span style="font:7.5pt verdana;">2</span> e</b></td> <td align="center">M_LOG2E</td> <td align="center"><?php echo M_LOG2E;?></td> </tr> <tr> <td align="center"><b>log<span style="font:7.5pt verdana;">10</span> e</b></td> <td align="center">M_LOG10E</td> <td align="center"><?php echo M_LOG10E;?></td> </tr> <tr> <td align="center"><b>log<span style="font:7.5pt verdana;">e</span> 2</b></td> <td align="center">M_LN2</td> <td align="center"><?php echo M_LN2;?></td> </tr> <tr> <td align="center"><b>log<span style="font:7.5pt verdana;">e</span> 10</b></td> <td align="center">M_LN10</td> <td align="center"><?php echo M_LN10;?></td> </tr> <tr> <td align="center"><b>Square Route of 2</b></td> <td align="center">M_SQRT2</td> <td align="center"><?php echo M_SQRT2;?></td> </tr> <tr> <td align="center"><b>1/(Square Route of 2)</b></td> <td align="center">M_SQRT1_2</td> <td align="center"><?php echo M_SQRT1_2;?></td> </tr> </table>
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