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Numeric string comparison
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‎README.md‎

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@@ -5,6 +5,7 @@ This is a list of some unextecped behaviours on developing in PHP.
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It doesn't mean that's bugs. It only means you should be aware of it.
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* [Numeric string comparison](numeric_string_comparison.md)
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* [0 to string comparison](0_to_string_comparison.md)
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* [Change boolean constants TRUE/FALSE](change_boolean_constants.md)
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* [Overwriting $this when using references](overwriting_this.md)

‎numeric_string_comparison.md‎

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Numeric string comparison
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=========================
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TODO: description
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Example:
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--------
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(http://3v4l.org/6OPhQ)
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```php
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echo "Compare non numeric string to string 0: ('str' == '0') = " . ('str' == '0' ? 'true' : 'false') . "\n";
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echo "Compare non numeric string to integer 0: ('str' == 0) = " . ('str' == 0 ? 'true' : 'false') . "\n";
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echo "Compare evtl. numeric string to string: ('1string' == '1') = " . ('1string' == '1' ? 'true' : 'false') . "\n";
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echo "Compare evtl. numeric string to number: ('1string' == 1) = " . ('1string' == 1 ? 'true' : 'false') . "\n";
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echo "Compare two numeric strings (same semantic 1): ('1e1' == '10') = " . ('1e1' == '10' ? 'true' : 'false') . "\n";
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echo "Compare two numeric strings (same semantic 2): ('1E1' == '10') = " . ('1E1' == '10' ? 'true' : 'false') . "\n";
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echo "Compare two numeric strings (same semantic 3): ('1e-1' == '0.1') = " . ('1e-1' == '0.1' ? 'true' : 'false') . "\n";
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echo "Compare two numeric strings (same semantic 4): ('1E-1' == '0.1') = " . ('1E-1' == '0.1' ? 'true' : 'false') . "\n";
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echo "Compare two numeric strings (same semantic 5): ('+1' == '1') = " . ('+1' == '1' ? 'true' : 'false') . "\n";
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echo "Compare two numeric strings (same semantic 6): ('+0' == '-0') = " . ('+0' == '-0' ? 'true' : 'false') . "\n";
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echo "Compare two numeric strings (precision 1): ('0.99999999999999994' == '1') = " . ('0.99999999999999994' == '1' ? 'true' : 'false') . "\n";
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echo "Compare two numeric strings (precision 2): ('0.99999999999999995' == '1') = " . ('0.99999999999999995' == '1' ? 'true' : 'false') . "\n";
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```
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```
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Compare non numeric string to string 0: ('str' == '0') = false
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Compare non numeric string to integer 0: ('str' == 0) = true
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Compare evtl. numeric string to string: ('1string' == '1') = false
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Compare evtl. numeric string to number: ('1string' == 1) = true
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Compare two numeric strings (same semantic 1): ('1e1' == '10') = true
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Compare two numeric strings (same semantic 2): ('1E1' == '10') = true
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Compare two numeric strings (same semantic 3): ('1e-1' == '0.1') = true
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Compare two numeric strings (same semantic 4): ('1E-1' == '0.1') = true
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Compare two numeric strings (same semantic 5): ('+1' == '1') = true
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Compare two numeric strings (same semantic 6): ('+0' == '-0') = true
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Compare two numeric strings (precision 1): ('0.99999999999999994' == '1') = false
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Compare two numeric strings (precision 2): ('0.99999999999999995' == '1') = true
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```

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