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Check for zero denominators contained within parenthesis

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This commit is contained in:
Brian Miyaji
2015-10-07 01:12:07 +11:00
parent 1e0094981d
commit 4bff0de5c4
1 changed files with 28 additions and 7 deletions
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35
includes/sp-core-functions.php
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@@ -225,6 +225,13 @@ if ( !function_exists( 'sp_flush_rewrite_rules' ) ) {
} }
} }
if ( !function_exists( 'sp_add_link' ) ) {
function sp_add_link( $string, $link = false, $active = true ) {
if ( empty( $link ) || ! $active ) return $string;
return '<a href="' . $link . '">' . $string . '</a>';
}
}
if ( !function_exists( 'sp_nonce' ) ) { if ( !function_exists( 'sp_nonce' ) ) {
function sp_nonce() { function sp_nonce() {
wp_nonce_field( 'sportspress_save_data', 'sportspress_meta_nonce' ); wp_nonce_field( 'sportspress_save_data', 'sportspress_meta_nonce' );
@@ -1134,19 +1141,33 @@ if ( !function_exists( 'sp_solve' ) ) {
// Remove space between equation parts // Remove space between equation parts
$equation = str_replace( ' ', '', $equation ); $equation = str_replace( ' ', '', $equation );
// Initialize Subequations
$subequations = array( $equation );
// Find all equation parts contained in parentheses
if ( preg_match_all( '~\((.*?)\)~', $equation, $results ) ) {
foreach ( sp_array_value( $results, 1, array() ) as $result ) {
if ( ! empty( $result ) ) {
$subequations[] = $result;
}
}
}
// Initialize subequation // Initialize subequation
$subequation = $equation; $subequation = $equation;
// Check each subequation separated by division // Check each subequation separated by division
while ( $pos = strpos( $subequation, '/' ) ) { foreach ( $subequations as $subequation ) {
$subequation = substr( $subequation, $pos + 1 ); while ( $pos = strpos( $subequation, '/' ) ) {
$subequation = substr( $subequation, $pos + 1 );
// Make sure paretheses match // Make sure paretheses match
if ( substr_count( $subequation, '(' ) === substr_count( $subequation, ')' ) ) { if ( substr_count( $subequation, '(' ) === substr_count( $subequation, ')' ) ) {
// Return zero if denominator is zero // Return zero if denominator is zero
if ( $eos->solveIF( $subequation, $vars ) == 0 ) { if ( $eos->solveIF( $subequation, $vars ) == 0 ) {
return 0; return 0;
}
} }
} }
} }