PHP Coding Standards

gistfile1.txt

PHP Coding Standards
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Single and Double Quotes 

echo '<a href="/static/link" title="Yeah yeah!">Link name</a>'; // if all are static
echo "<a href='$link' title='$linktitle'>$linkname</a>"; if mix of variable and string

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give [tab]   when write any variable
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Use elseif, not else if
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<input name="<?php echo esc_attr( $name ); ?>" />    // use "/" at end

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foreach ( $foo as $bar ) {  // space between ( )  start middle end
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$x = $foo['bar']; // correct
$x = $foo[ 'bar' ]; // incorrect
 
$x = $foo[0]; // correct
$x = $foo[ 0 ]; // incorrect
 
$x = $foo[ $bar ]; // correct
$x = $foo[$bar]; // incorrect
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switch ( $foo ) {
    case 'bar': // correct
    case 'ba' : // incorrect
}
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function sum( $a, $b ): float {   // sum( )
    return $a + $b;
}
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Use lowercase letters in variable, action/filter, and function names (never camelCase). Separate words via underscores.
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In general, readability is more important than cleverness or brevity.
isset( $var ) || $var = some_function();
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