## PHP code

``` <?php/* * Makes the value of "result" congruent to "value1" modulo "value2". * opcode number: 5 */echo 6 % 3;?> ```

## PHP opcodes

Function name: (null)

Compiled variables: none

line#op fetchextreturn operands
60 MOD   ~0 6,3
1 ECHO     ~0
72 RETURN     1
``` To determine odd or even it's faster and more efficient to use the bitwise & operator:\$a = 3;if (\$a & 1) {    echo 'odd';} else {     echo 'even';}// returns 'odd' ```
``` A function to handle integers of any length, including negatives. Returns remainder but also calculates division in the process (could be useful in some cases).<?phpfunction remainder(\$dividend, \$divisor) {    if (\$dividend == 0 || \$divisor == 0) return 0;    \$dividend .= '';    \$remainder = 0;    \$division = '';        // negative case    while (\$dividend < 0) {        \$dividend += \$divisor;        if (\$dividend >= 0) return \$dividend;    }        // positive case    while ((\$remainder.\$dividend)*1 > \$divisor) {        // get remainder big enough to divide        while (\$remainder*1 < \$divisor) {            \$remainder .= \$dividend[0];            \$remainder *= 1;            \$dividend = substr(\$dividend, 1);        }                // get highest multiplicator for remainder        \$mult = floor(\$remainder / \$divisor);        // add multiplicator to division        \$division .= \$mult.'';        // subtract from remainder        \$remainder -= \$mult*\$divisor;    }        // add remaining zeros if any, to division    if (strlen(\$dividend) > 0 && \$dividend*1 == 0) {        \$division .= \$dividend;    }        return \$remainder;} ```
``` Might be helpful: I had to create and "INSERT INTO" on every 50th row: <?php \$lineBreak = 50; \$tableName = 'user'; \$tableFields = 'id, name, password'; ?> in the loop: <?php if (\$counter === 0 || \$counter % \$lineBreak === 0) {     echo "INSERT INTO \$tableName (\$tableFields) VALUES ("; } else {     echo ' ('; } // add values comma-delimited if (\$counter === 0 || \$counter % \$lineBreak === 0) {     \$insertStmt .= ');'; } else {     \$insertStmt .= '),'; } ?> (in my case I had to check if \$no % \$o === 0) ```