What is the output of the following code snippet? $a = '10'; echo $a + 5;

Explanation

PHP performs type juggling when an arithmetic operator is applied to a string containing a numeric value. The string '10' is implicitly converted to the integer 10, allowing the addition operation to result in 15. It does not perform string concatenation, which is reserved for the dot (.) operator.

Key points

Arithmetic operators trigger numeric type juggling
Strings starting with numeric characters are converted to integers or floats
Concatenation uses the dot operator, not the plus operator

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What is the output of the following code snippet? $a = ’10’; echo $a + 5;