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* Boolean A number converted into boolean became false if the original value is zero, and true otherwise.
<?php echo ((boolean) 0) !== TRUE; // output 1 echo ((boolean) 99) === TRUE; // output 1 A string is converted to false only if its empty or '0'. If it contains any other data (even multiple zeros) it is converted to true.
<?php echo ((boolean) '0') === FALSE; // output 1 echo ((boolean) '00') === FALSE; // output nothing * Array - Are containers of data elements * Object - Are containers of both data and code * NULL A variable is considered to be NULL if it has been assigned the special value NULL, or if it has not yet been assigned a value at all. * Converting Between Data Types PHP takes care of converting between data types transparently. However, it is still possible to force the conversion of a value to a specific type
<?php $x = 10.88; echo (int) $x; // output 10
1) What is the output? <?php echo ((boolean) 0) !== TRUE; echo ((boolean) 99) === FALSE;





2) What is the output? <?php echo ((boolean) '0') !== FALSE; echo ((boolean) '00') === FALSE;





3) What is the output? <?php echo (boolean) "00"; echo (int) "a";








* Boolean A number converted into boolean became false if the original value is zero, and true otherwise.
<?php echo ((boolean) 0) !== TRUE; // output 1 echo ((boolean) 99) === TRUE; // output 1 A string is converted to false only if its empty or '0'. If it contains any other data (even multiple zeros) it is converted to true.
<?php echo ((boolean) '0') === FALSE; // output 1 echo ((boolean) '00') === FALSE; // output nothing * Array - Are containers of data elements * Object - Are containers of both data and code * NULL A variable is considered to be NULL if it has been assigned the special value NULL, or if it has not yet been assigned a value at all. * Converting Between Data Types PHP takes care of converting between data types transparently. However, it is still possible to force the conversion of a value to a specific type
<?php $x = 10.88; echo (int) $x; // output 10

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