php - TRUE or true difference?
105242
Uppercase Booleans vs. Lowercase in PHP
4772
Difference between "not equal" operators  and != in PHP
34563
Why does PHP consider 0 to be equal to a string?
32232
How does the "&" operator work in a PHP function?
46395
Is it 100% correct to replace !!someVar with Boolean(someVar)?
2034
Which is faster in PHP, $array[] = $value or array_push($array, $value)?
96779
PHP: exceptions vs errors?
42952
Performance of variable expansion vs. sprintf in PHP
153624
What's the difference between is_null($var) and ($var === null)?
70947
DEFINE vs Variable in PHP
124650
Is `if (condition = value)` the correct syntax for comparison?
93920
What does @ mean in PHP?
134742
String comparison in Python: is vs. ==
33772
Is there any difference in equals and == for String variables?
69801
What does it mean when ST_Equals returns false and `=` returns true?
139020
explain php output
136411
PHP - Variable inside variable?