Hướng dẫn check equal string php
Comparison operators, as their name implies, allow you to compare two values. You may also be interested in viewing the type comparison tables, as they show examples of various type related comparisons. If both operands are numeric strings, or one operand is a number and the other one is a numeric string, then the comparison is done numerically. These rules also apply to the switch statement. The type conversion does not take place when the comparison is Warning Prior to PHP 8.0.0, if a string is compared to a number or a numeric string then the
string was converted to a number before performing the comparison. This can lead to surprising results as can be seen with the following example: Output of the above example in PHP 7: Output of the above example in PHP 8: // Strings // Arrays // Objects // not only values are compared; keys must match For various types, comparison is done according to the following table (in order). Example #1 Boolean/null comparison Example #2 Transcription of standard array comparison Warning Because of the way floats are represented internally, you should not test two floats for equality. See the documentation for float for more
information. Note: Be aware that PHP's type juggling is not always obvious when comparing values of different types, particularly comparing ints to bools or ints to strings. It is therefore generally advisable to use While identity
comparison ( Another conditional operator is the "?:" (or ternary) operator. Example #3 Assigning a default value The expression It is possible to leave out the middle part of the ternary operator. Expression Note: Please note
that the ternary operator is an expression, and that it doesn't evaluate to a variable, but to the result of an expression. This is important to know if you want to return a variable by reference. The statement
Null Coalescing OperatorAnother useful shorthand operator is the "??" (or null coalescing) operator. Example #6 Assigning a default value
The expression In particular, this operator does not emit a notice or warning if the left-hand side value does not exist, just like isset(). This is especially useful on array keys.
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count($a1) == count($a2))
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